Hidradenitis Suppurativa: Symptoms, Causes, Diagnosis and Treatment
Table of Contents
Key takeaways
- Hidradenitis suppurativa is a long-term inflammatory skin condition causing painful lumps, abscesses, sinus tracts and scarring.
- It commonly affects skin folds such as the armpits, groin, vulval area, buttocks and under the breasts.
- HS is not caused by poor hygiene and is not contagious, but smoking, weight, hormones and genetics may influence severity.
- Early diagnosis and treatment can reduce flares, scarring and the emotional impact of the condition.
Article type: medical_condition.
Overview
Hidradenitis suppurativa, often shortened to HS, is a chronic inflammatory skin condition affecting hair follicles in areas where skin rubs and sweat glands are common. It causes painful boil-like lumps, abscesses, blackheads, tunnels under the skin called sinus tracts, pus leakage and scarring. It can affect intimate areas, so many women delay seeking help because of embarrassment or because symptoms are mistaken for shaving irritation, acne, ingrown hairs or recurrent boils. HS is a medical condition, not a hygiene problem, and earlier treatment can reduce pain, scarring and quality-of-life impact.
Symptoms and concerns
Hidradenitis suppurativa can present differently from person to person. The pattern, duration, severity and associated symptoms matter because they help separate mild or expected symptoms from problems that need urgent assessment.
- painful deep lumps, nodules or abscesses in the armpits, groin, vulval area, buttocks or under the breasts
- blackheads, recurrent boils, pus leakage or unpleasant odour during flares
- sinus tracts under the skin that open and drain
- thickened scars, restricted movement or tender skin after repeated inflammation
- flare patterns linked with periods, stress, heat, sweating, friction or smoking in some people
Causes and mechanism
HS is thought to begin when hair follicles become blocked and rupture, triggering an intense immune response in surrounding skin. Inflammation recruits immune cells, causes painful swelling and can form abscesses. Repeated inflammation can create tunnels and scarring. The exact cause is not fully understood, but it is not simply an infection and is not contagious. Hormonal influences, genetics, smoking, weight-related friction and inflammatory pathways may all contribute. Bacteria can be present in draining lesions, but antibiotics may be used for both antimicrobial and anti-inflammatory effects.
Risk factors
Risk factors do not mean someone will definitely develop the condition, and absence of risk factors does not rule it out. They help guide assessment and prevention conversations.
- being female, with symptoms often beginning after puberty
- family history of HS or other inflammatory conditions
- smoking, which is associated with HS and may worsen severity
- living with overweight or obesity, partly through friction and inflammation
- hormonal changes, including menstrual-cycle flares in some women
Possible complications
HS can cause scarring, persistent tunnels, restricted movement, secondary infection, chronic pain and significant emotional distress. Flares in the vulval, groin or buttock area can affect sex, exercise, work, sleep and confidence. Severe long-standing disease can rarely be associated with lymphoedema or skin cancer in chronically scarred areas, especially perianal disease, so persistent non-healing wounds need specialist review. Anxiety and depression are common enough that psychological support should be considered part of care, not an afterthought.
Diagnosis and assessment
Diagnosis is usually clinical and based on typical lesions, typical locations and recurrence. A GP or dermatologist asks about duration, flare frequency, sites affected, family history, smoking, menstrual pattern, pain, drainage and previous treatments. Swabs may be taken if infection is suspected, but a negative or positive swab does not by itself diagnose HS. The clinician may grade severity and check for related conditions such as acne, inflammatory bowel disease, metabolic risk or depression depending on symptoms.
Treatment and management
Treatment is staged by severity. Options may include antiseptic washes, topical treatments, oral antibiotics, hormonal approaches, pain management, steroid injections, biologic medicines, laser hair reduction in selected cases, drainage for acute abscesses and surgery for persistent tunnels or scarring. Suitability is confirmed after consultation, especially in pregnancy, breastfeeding, immune suppression or when medicines have monitoring requirements. Early dermatology referral may be needed for recurrent, scarring or extensive disease.
Assessment details that change care
For Hidradenitis suppurativa, the details that most often change care are not just whether a symptom is present, but how quickly it started, whether it is worsening, whether it is recurrent, and whether it appears with other warning signs. A clinician will usually want to know about features such as painful deep lumps, nodules or abscesses in the armpits, groin, vulval area, buttocks or under the breasts; blackheads, recurrent boils, pus leakage or unpleasant odour during flares; sinus tracts under the skin that open and drain. They will also ask about context, including being female, with symptoms often beginning after puberty; family history of HS or other inflammatory conditions; smoking, which is associated with HS and may worsen severity. This is why a concise symptom diary can be useful: note the date symptoms started, what makes them better or worse, medicines already tried, pregnancy or menopause context where relevant, immune suppression, recent surgery or travel, and whether the problem is affecting sleep, eating, urination, sex, movement or work.
Severity is judged by combining symptoms, examination findings, risk factors and test results. A mild-looking symptom can matter more if it is new, escalating, associated with fever or systemic illness, or happening in a baby, pregnancy, older age or immune suppression. Equally, a visible lump, rash, blister or blood-test result may be less urgent when it is stable and the person is otherwise well. The safest approach is to avoid forcing the condition into a home diagnosis. Assessment-first language is especially important for Hidradenitis suppurativa because treatment choices may differ according to anatomy, infection risk, recurrence pattern, underlying disease and personal circumstances.
Before an appointment, useful questions include: What diagnosis is most likely and what else needs to be ruled out? Which symptoms should trigger same-day help? Are tests needed now or only if symptoms persist? What treatment options are reasonable, what benefits are expected, and what limitations or side effects should be discussed? Are there activities, sex, contact lenses, exercise, lifting, pregnancy plans, baby contact or medicines that should be paused until review? This kind of practical planning helps turn a general article into safer, more useful health information.
Self-care and prevention
Self-care cannot replace medical treatment, but it can reduce irritation. Wear breathable, non-rubbing clothing, avoid squeezing lesions, use gentle fragrance-free skin care, consider dressings for drainage, stop smoking with support, and discuss weight support if relevant and wanted. Hair removal can trigger flares for some people, so avoid aggressive shaving over active lesions. Track menstrual, heat, friction and stress patterns to support treatment conversations.
When to seek medical advice
Seek prompt medical advice for rapidly worsening pain, spreading redness, fever, feeling very unwell, a large abscess, symptoms near the anus, or non-healing wounds. Use NHS 111 for urgent advice if infection seems to be spreading or pain is severe. Call 999 for life-threatening illness, sepsis symptoms, confusion, collapse or severe systemic deterioration.
Sources
- NHS, Hidradenitis suppurativa: https://www.nhs.uk/conditions/hidradenitis-suppurativa/
Relevance: Supports symptoms, causes, affected sites, treatments and long-term condition framing. - BAD, Hidradenitis suppurativa patient information: https://www.bad.org.uk/pils/hidradenitis-suppurativa/
Relevance: Supports dermatology-specific patient information on HS features, triggers and treatments. - Mayo Clinic, Hidradenitis suppurativa: mayoclinic.org guidance page link unavailable during validation (mayoclinic.org guidance page, link unavailable during validation)
Relevance: Used as a benchmark for symptoms, causes, risk factors and complications.
Disclaimer
Educational only. Results vary. Not a cure. Use NHS 111 for urgent advice where symptoms are concerning or worsening, and call 999 in a life-threatening emergency.
