What Causes Hidradenitis Suppurativa?
Hidradenitis suppurativa results from a complex interplay of genetic predisposition, hormonal influences, immune system dysfunction, and environmental factors. At Hazany Derm, we help patients understand these underlying causes to develop effective treatment strategies for this challenging skin condition.
Hidradenitis suppurativa (HS) is a chronic inflammatory skin condition that affects millions of people worldwide, yet its exact causes remain complex and multifaceted. This painful condition manifests as recurrent boils, abscesses, and scarring in areas where skin rubs together, such as the armpits, groin, and under the breasts. Understanding what triggers and perpetuates this condition is crucial for both patients and healthcare providers in developing effective management strategies.
The development of hidradenitis suppurativa involves a intricate web of factors that work together to create the perfect storm for this inflammatory disease. While researchers continue to uncover new insights about HS, current evidence points to a combination of genetic susceptibility, hormonal influences, immune system dysfunction, and environmental triggers. At Hazany Derm, we recognize that each patient's experience with HS is unique, requiring a personalized approach to understanding their specific contributing factors.
For many patients seeking answers about their condition, learning about the causes of hidradenitis suppurativa can provide both relief and empowerment. Knowledge about the underlying mechanisms helps dispel common misconceptions about HS being caused by poor hygiene or being contagious. Instead, it reveals HS as a legitimate medical condition with identifiable biological and environmental contributors that can be addressed through proper medical care and lifestyle modifications.
Genetic and Hereditary Factors
Genetics play a significant role in hidradenitis suppurativa development, with research showing that approximately one-third of patients have a family history of the condition. This hereditary component suggests that certain genetic variations can predispose individuals to developing HS throughout their lifetime. Scientists have identified several genes associated with increased HS risk, including those involved in immune system regulation and inflammatory responses. The genetic influence explains why some families see multiple members affected by this condition across generations.
The most well-studied genetic connections involve mutations in the gamma-secretase complex genes, particularly NCSTN, PSEN1, and PSENEN. These genes are responsible for producing proteins that regulate cell signaling and inflammation pathways in the skin. When these genes contain mutations, they can disrupt normal cellular processes and contribute to the chronic inflammation characteristic of hidradenitis suppurativa. However, having these genetic variations doesn't guarantee that someone will develop HS, indicating that other factors must also be present.
Research has also identified genetic links between hidradenitis suppurativa and other inflammatory conditions such as Crohn's disease and certain types of arthritis. This connection suggests that some individuals may have a genetic predisposition to inflammatory diseases in general, with HS being one possible manifestation. Dr. Salar Hazany often explains to patients that understanding their genetic risk factors can help guide treatment decisions and family planning considerations.
The hereditary nature of HS manifests in several important patterns:
- Autosomal dominant inheritance: Some families show a clear pattern where the condition passes from parent to child with a 50% probability
- Variable expression: Family members with the same genetic mutations may experience different severities of HS symptoms
- Incomplete penetrance: Not everyone who inherits HS-associated genetic variants will actually develop the condition
- Polygenic influences: Multiple genes likely contribute to HS risk, making the inheritance pattern complex
While genetic testing for hidradenitis suppurativa is not routinely recommended for all patients, it may be considered in cases with strong family histories or when multiple family members are affected. Understanding the genetic component helps patients realize that developing HS is not their fault and that they inherited a biological predisposition to this condition. At Hazany Derm, we use this genetic information to help families understand their risk patterns and make informed decisions about monitoring and early intervention strategies.
The genetic foundation of hidradenitis suppurativa also influences how patients respond to various treatments, as individual genetic variations can affect drug metabolism and inflammatory pathways. This personalized medicine approach is becoming increasingly important in HS management, allowing healthcare providers to tailor treatments based on each patient's unique genetic profile and disease characteristics.
Hormonal Influences and Triggers
Hormonal fluctuations play a crucial role in hidradenitis suppurativa development and progression, with the condition showing clear patterns related to hormonal life stages and changes. The disease typically begins after puberty, rarely occurs before adolescence, and often worsens during periods of hormonal instability such as menstruation, pregnancy, or menopause. Androgens, particularly testosterone and its metabolites, appear to significantly influence HS activity by affecting hair follicle function and sebaceous gland production. This hormonal connection explains why hidradenitis suppurativa affects women more frequently than men and why symptoms often correlate with menstrual cycles.
Estrogen levels also impact hidradenitis suppurativa, though the relationship is more complex than with androgens. Some women experience improvement in their HS symptoms during pregnancy when estrogen levels are elevated, while others may see worsening during the postpartum period when hormone levels drop dramatically. Birth control pills and hormone replacement therapy can either improve or worsen HS symptoms depending on the specific hormonal composition and individual patient factors. The team at Hazany Derm carefully evaluates each patient's hormonal history to identify potential triggers and therapeutic opportunities.
The timing of HS onset often coincides with major hormonal transitions in life, providing important clues about the condition's underlying mechanisms. Women frequently report that their symptoms began during puberty, worsened during pregnancy, or changed significantly during perimenopause. Men with HS may notice connections between their symptoms and stress-related hormonal changes or conditions that affect testosterone levels. Understanding these hormonal patterns helps healthcare providers predict disease progression and plan appropriate interventions.
Several specific hormonal factors contribute to HS development and severity:
- Androgen sensitivity: Increased sensitivity to male hormones can trigger hair follicle inflammation and blockage in HS-prone areas
- Insulin resistance: Higher insulin levels can worsen hormonal imbalances and contribute to inflammatory processes in the skin
- Stress hormones: Elevated cortisol levels from chronic stress can suppress immune function and exacerbate HS symptoms
- Thyroid dysfunction: Both overactive and underactive thyroid conditions can influence HS severity through metabolic and hormonal effects
Hormonal influences on hidradenitis suppurativa extend beyond sex hormones to include metabolic hormones like insulin and leptin. Many patients with HS also have insulin resistance or diabetes, conditions that create systemic inflammation and can worsen skin symptoms. The relationship between obesity, metabolic syndrome, and HS creates a complex interplay where hormonal dysfunction, inflammation, and mechanical factors all contribute to disease progression.
Managing the hormonal aspects of hidradenitis suppurativa often requires a multidisciplinary approach involving dermatologists, endocrinologists, and gynecologists. Anti-androgen medications, insulin-sensitizing drugs, and carefully selected hormonal contraceptives can all play roles in HS management when hormonal factors are identified as significant contributors. At Hazany Derm, we work closely with other specialists to address the full spectrum of hormonal influences affecting our HS patients.
Environmental and Lifestyle Factors
Environmental and lifestyle factors significantly contribute to hidradenitis suppurativa development and can dramatically influence disease severity and progression. Smoking stands out as one of the most important modifiable risk factors, with studies showing that over 80% of HS patients are current or former smokers. The chemicals in tobacco smoke promote inflammation throughout the body and may directly affect hair follicle function in areas prone to HS development. Mechanical friction from tight clothing, excessive sweating, and repetitive skin trauma in fold areas can trigger and worsen HS lesions by creating an environment conducive to bacterial overgrowth and inflammation.
Obesity represents another major environmental risk factor that creates multiple pathways for HS development and progression. Excess weight increases mechanical friction in skin fold areas, promotes systemic inflammation through adipose tissue, and contributes to hormonal imbalances that can worsen HS symptoms. The relationship between obesity and HS creates a challenging cycle where the condition can limit physical activity due to pain and discomfort, potentially leading to further weight gain. Additionally, certain medications, stress levels, and occupational exposures to chemicals or irritants may serve as environmental triggers for susceptible individuals.
Diet and nutrition have emerged as important environmental factors in hidradenitis suppurativa, though the relationships are complex and vary among individuals. Some patients report improvements when avoiding dairy products, refined sugars, or foods high in glycemic index, while others benefit from anti-inflammatory dietary patterns. The gut microbiome's influence on systemic inflammation may explain why dietary modifications can impact HS symptoms in some patients. Hazany Derm specialists often work with patients to identify personal dietary triggers and develop sustainable nutritional strategies that support overall skin health.
Key environmental and lifestyle factors that influence HS include:
- Smoking and nicotine exposure: Direct inflammatory effects on skin and impaired wound healing significantly worsen HS outcomes
- Mechanical trauma: Tight clothing, aggressive shaving, and repetitive friction in fold areas can trigger new lesions and prevent healing
- Heat and humidity: Excessive sweating and moist environments promote bacterial growth and can exacerbate existing HS lesions
- Chemical exposures: Harsh soaps, deodorants, and occupational chemicals may irritate sensitive skin and trigger inflammatory responses
The role of bacterial colonization in hidradenitis suppurativa represents an important environmental factor that bridges the gap between external triggers and internal immune responses. While HS is not primarily an infectious disease, certain bacteria can colonize HS lesions and contribute to ongoing inflammation and secondary infections. The disrupted skin barrier in HS-affected areas makes patients more susceptible to bacterial overgrowth, creating a cycle where environmental bacteria worsen the condition while the condition creates an environment favorable to bacterial growth.
Stress management and sleep quality also function as important environmental factors in HS management, as chronic stress and poor sleep can worsen inflammatory conditions throughout the body. Many patients notice correlations between stressful life events and HS flares, suggesting that psychological stress may serve as a trigger through its effects on immune function and hormone levels. At Hazany Derm, we emphasize the importance of comprehensive lifestyle modifications that address not only direct physical triggers but also the broader environmental factors that can influence HS progression and treatment outcomes.
Frequently Asked Questions
Is hidradenitis suppurativa caused by poor hygiene?
No, hidradenitis suppurativa is not caused by poor hygiene, despite common misconceptions. This inflammatory skin condition results from a complex interaction of genetic factors, hormonal influences, and immune system dysfunction. Dr. Salar Hazany emphasizes that patients should never feel ashamed or blamed for their condition, as it develops due to biological factors beyond their control. While maintaining good hygiene can help manage symptoms and prevent secondary infections, excessive scrubbing or harsh cleansers may actually worsen the condition by irritating already inflamed skin. The myth about hygiene being the cause has unfortunately led to stigma and delayed treatment for many patients. Understanding the true causes helps patients seek appropriate medical care rather than attempting ineffective home remedies. Proper medical treatment addressing the underlying inflammatory processes is essential for managing HS effectively.
Can stress cause hidradenitis suppurativa flares?
Yes, stress can definitely trigger hidradenitis suppurativa flares, though it's not a direct cause of the condition itself. Chronic stress affects the immune system and increases inflammatory markers throughout the body, which can worsen existing HS symptoms. At Hazany Derm, we frequently see patients who notice their symptoms intensify during particularly stressful periods in their lives. Stress hormones like cortisol can disrupt normal immune function and may interfere with the skin's healing processes. Additionally, stress often leads to other behaviors that can worsen HS, such as poor sleep, dietary changes, or increased smoking. While stress management techniques like meditation, exercise, or counseling won't cure HS, they can be valuable components of a comprehensive treatment plan. We encourage patients to identify their personal stress triggers and develop healthy coping strategies as part of their overall HS management approach.
Does diet play a role in causing hidradenitis suppurativa?
While diet doesn't directly cause hidradenitis suppurativa, certain foods may trigger flares or worsen symptoms in some patients. The team at Hazany Derm recognizes that dietary triggers vary significantly among individuals, making personalized dietary assessment important for optimal management. Some patients report improvements when avoiding dairy products, refined sugars, or high-glycemic foods, while others benefit from anti-inflammatory diets rich in omega-3 fatty acids and antioxidants. The connection between diet and HS may relate to systemic inflammation, insulin resistance, or gut microbiome changes that influence immune function. Foods that promote inflammation or worsen metabolic conditions like diabetes may indirectly contribute to HS severity. However, it's important to note that dietary modifications alone are rarely sufficient to control HS and should complement, not replace, appropriate medical treatment. We often recommend keeping a food diary to help identify potential dietary triggers while maintaining proper nutrition.
Is hidradenitis suppurativa an autoimmune disease?
Hidradenitis suppurativa has autoimmune characteristics, but it's more accurately described as an autoinflammatory condition rather than a classic autoimmune disease. Dr. Hazany explains that HS involves dysfunction in the innate immune system, leading to excessive inflammatory responses in hair follicles and surrounding skin tissue. Unlike typical autoimmune diseases that involve antibodies attacking the body's own tissues, HS appears to result from overactive inflammatory pathways that respond inappropriately to normal stimuli. The condition shares features with other inflammatory diseases and often occurs alongside conditions like inflammatory bowel disease, suggesting common underlying immune system abnormalities. Genetic mutations affecting immune signaling pathways contribute to this dysregulated inflammatory response. Understanding HS as an inflammatory condition rather than purely infectious or hygiene-related has revolutionized treatment approaches, leading to the use of immunosuppressive and anti-inflammatory therapies. This classification helps explain why antibiotics alone are often insufficient and why systemic anti-inflammatory treatments can be effective.
Can hormonal birth control cause hidradenitis suppurativa?
Hormonal birth control doesn't typically cause hidradenitis suppurativa in people without existing predisposition, but it can influence symptom severity in those who already have the condition. Hazany Derm specialists carefully evaluate each patient's hormonal history since birth control effects on HS vary significantly depending on the specific hormonal composition. Some birth control methods containing anti-androgenic properties may actually improve HS symptoms by reducing the effects of male hormones that can worsen the condition. Conversely, birth control with androgenic effects might worsen symptoms in some patients. The relationship is complex because HS involves multiple hormonal pathways beyond just sex hormones, including insulin and stress hormones. Many women notice changes in their HS symptoms when starting, stopping, or switching birth control methods, making it important to track these patterns. Rather than avoiding hormonal birth control entirely, patients should work with their healthcare providers to identify options that might help rather than hinder their HS management while meeting their contraceptive needs.
Does smoking really make hidradenitis suppurativa worse?
Yes, smoking significantly worsens hidradenitis suppurativa and is one of the strongest modifiable risk factors associated with the condition. Dr. Salar Hazany emphasizes that over 80% of HS patients are current or former smokers, a rate much higher than in the general population. Smoking promotes systemic inflammation throughout the body and impairs wound healing, making HS lesions more persistent and prone to complications. The chemicals in tobacco smoke may directly affect hair follicle function and immune responses in areas prone to HS development. Nicotine and other tobacco compounds can worsen the inflammatory pathways that drive HS progression. Studies have shown that patients who quit smoking often experience improvement in their HS symptoms, though changes may take months to become apparent. Smoking cessation is considered one of the most important lifestyle modifications for HS patients, often recommended as a first-line intervention alongside medical treatments. While quitting smoking won't cure HS, it can significantly improve treatment outcomes and reduce disease severity over time.
Can hidradenitis suppurativa be caused by deodorants or antiperspirants?
Deodorants and antiperspirants don't cause hidradenitis suppurativa, but they may worsen symptoms in people who already have the condition. The Hazany Derm clinic explains that while these products don't create the underlying genetic and immune factors necessary for HS development, they can serve as irritants that trigger flares in susceptible individuals. Aluminum-based antiperspirants, fragrances, and other chemicals in these products may cause contact dermatitis or irritation in the sensitive skin areas where HS typically occurs. Some patients find that switching to gentler, fragrance-free products or natural alternatives helps reduce irritation and frequency of flares. However, completely avoiding deodorants isn't necessary for most patients, and the benefits of odor control often outweigh potential risks when appropriate products are chosen. The key is finding products that don't irritate individual patients' skin while maintaining good hygiene practices. We often recommend patch testing new products on unaffected skin first and choosing products specifically designed for sensitive skin when possible.
Is hidradenitis suppurativa caused by bacterial infections?
Hidradenitis suppurativa is not primarily caused by bacterial infections, although bacteria can play a secondary role in worsening the condition. The experts at Hazany Derm explain that HS is fundamentally an inflammatory condition involving hair follicle dysfunction and immune system abnormalities, not a primary bacterial disease. However, the disrupted skin barrier and chronic inflammation in HS lesions create an environment where bacteria can more easily colonize and multiply. When bacteria do colonize HS lesions, they can contribute to ongoing inflammation, secondary infections, and delayed healing, making the condition appear worse. This bacterial involvement explains why some patients experience temporary improvement with antibiotics, even though the underlying inflammatory process continues. Common bacteria found in HS lesions include Staphylococcus and Streptococcus species, though the bacterial populations can vary among patients. Understanding this distinction is important because it means that while antibiotics may help manage bacterial complications, addressing the underlying inflammatory process requires different therapeutic approaches such as anti-inflammatory medications or immunosuppressive treatments.
