Hidradenitis suppurativa (HS) is a chronic, inflammatory skin condition that affects the hair follicles and sweat glands. Often misunderstood and misdiagnosed, HS disease causes painful lumps, abscesses, and scarring that most commonly develop in areas where skin rubs together — such as the armpits, groin, buttocks, and under the breasts. This HS skin condition is not contagious, nor is it caused by poor hygiene. It is a complex immune-mediated disease that can significantly impact a person’s quality of life. Recognizing the symptoms of hidradenitis suppurativa early is critical to getting the right care and slowing its progression.
1. Painful, Deep-Seated Lumps (HS Bumps)
One of the earliest and most recognizable signs of hidradenitis suppurativa is the appearance of painful, firm nodules or lumps beneath the skin. These HS bumps:
- Typically measure between 1 to 2 centimeters in diameter
- Feel tender or extremely sore to the touch
- Develop in areas with high concentrations of apocrine sweat glands and hair follicles, such as the armpits, groin, inner thighs, and buttocks
- May persist for several days to weeks before rupturing or resolving
Unlike a typical pimple or boil, these nodules form deep within the skin and do not respond to standard acne treatments. In many cases, they recur in the same location, becoming increasingly painful with each episode. Patients often describe the pain as a constant, deep throbbing sensation that worsens with movement.
2. Blackheads Appearing in Clusters
A distinctive early sign of HS skin disease is the presence of double-ended or paired blackheads clustered in affected areas. Unlike typical blackheads associated with acne, these have unique characteristics:
- They often appear in groups of two connected comedones (called “double-headed” or “bridged” blackheads)
- They are most commonly found on the inner thighs, armpits, and around the groin
- They may not cause pain initially but are considered a hallmark early warning sign of HS
- Their presence alongside recurring nodules strongly suggests an HS diagnosis
Dermatologists often look for these clustered blackheads as a key diagnostic clue when evaluating patients for hidradenitis suppurativa. Noticing them early can help lead to a faster diagnosis.
3. Abscess Formation and Pus Discharge
As HS progresses, the painful nodules under the skin can rupture or evolve into abscesses — pockets filled with pus. This stage of the HS skin condition involves:
- Swollen, red, and inflamed areas that are warm to the touch
- Spontaneous rupture of the abscess, releasing foul-smelling, bloody, or purulent discharge
- Temporary relief of pain after rupture, but the lesion typically refills and recurs
- Potential risk of secondary bacterial infection if wounds are not properly managed
The recurring nature of abscesses in HS is one of the key features that sets it apart from ordinary skin infections. Each flare-up can be more severe than the last, contributing to long-term tissue damage if left unmanaged.
4. Tunnels (Sinus Tracts) Under the Skin
In more advanced stages of hidradenitis suppurativa, the repeated cycles of inflammation and healing can lead to the formation of sinus tracts — also called tunnels or fistulas — that connect multiple nodules beneath the surface of the skin. Key features include:
- Interconnected channels that run under the skin, linking separate lesion sites
- Continuous or intermittent drainage of pus or blood from tunnel openings
- A firm, cord-like feel when gently palpated along the skin surface
- Significant pain and limited mobility if tunnels form around joints (e.g., armpits or groin)
Sinus tracts are a hallmark of Stage II and Stage III HS (as classified by the Hurley staging system) and indicate that the disease has become more severe. They are among the most difficult features of HS to manage and are a major reason patients experience chronic, persistent symptoms.
5. Scarring and Skin Changes
Repeated inflammation, abscess rupture, and sinus tract formation inevitably lead to permanent changes in the skin. Scarring from hidradenitis suppurativa can be both disfiguring and functionally limiting:
- Hypertrophic or rope-like scars may develop across affected areas
- Skin may become thickened and hardened (fibrosis) over time
- Areas of skin discoloration (hyperpigmentation or hypopigmentation) are common after lesions heal
- Contracture scars in the armpits or groin can restrict movement and reduce range of motion
Scarring is not merely cosmetic — it can cause chronic discomfort, restrict physical activity, and significantly affect a patient’s body image and self-esteem. This makes early recognition and management of HS symptoms especially important to minimize long-term skin damage.
6. Persistent Itching and Burning Sensation
Before a new HS lesion becomes visible, many patients experience early sensory warning signs in the skin. These prodromal symptoms can include:
- A persistent itching or burning sensation at a site that has previously been affected
- A feeling of warmth or localized heat in the skin, indicating early inflammation
- Hypersensitivity or tenderness even without a visible lump
- A “tingling” feeling that many HS patients learn to associate with the start of a flare
These early sensations can serve as useful signals for patients who learn to recognize their own flare patterns. While they do not always result in a full lesion, they indicate active inflammation is building beneath the skin surface.
7. Swollen Lymph Nodes
Because hidradenitis suppurativa involves chronic immune system activation and repeated localized infections, it is not uncommon for patients to experience swollen or enlarged lymph nodes near the affected areas. This symptom:
- Often occurs in the groin (inguinal), armpit (axillary), or neck lymph node regions, depending on where HS lesions are located
- May feel tender or firm upon palpation
- Can come and go with flare-ups and periods of remission
- Is a sign that the immune system is responding to ongoing inflammation and potential bacterial activity in the skin
While swollen lymph nodes in HS are generally reactive (meaning they are responding to inflammation rather than indicating a separate infection), they should always be evaluated by a healthcare professional to rule out other causes.
8. Skin Redness and Inflammation
Visible redness (erythema) and inflammation of the skin around affected areas is a consistent feature of active HS flares. This symptom manifests as:
- Deep red to purple discoloration surrounding nodules and abscesses
- Diffuse redness that may extend beyond the immediate lesion site
- Swelling and puffiness that makes the skin appear raised or engorged
- Increased skin temperature in inflamed areas
The degree of redness and swelling often reflects the severity of an active flare. In advanced HS, large regions of skin may appear chronically red and inflamed even outside of acute episodes, due to underlying ongoing inflammation and tissue remodeling.
9. Fatigue and General Malaise
Hidradenitis suppurativa is not just a skin disease — it is a systemic inflammatory condition that affects the whole body. Many patients with moderate to severe HS report significant systemic symptoms, including:
- Persistent, unexplained fatigue that is disproportionate to physical activity levels
- A general feeling of being unwell (malaise), particularly during flares
- Low-grade fever during acute episodes, especially when abscesses are active
- Reduced energy and difficulty performing daily tasks
These systemic symptoms are believed to result from elevated levels of inflammatory cytokines (such as TNF-alpha and interleukins) circulating throughout the body. HS has also been associated with other systemic inflammatory conditions, including inflammatory bowel disease and metabolic syndrome, which can further contribute to fatigue and poor overall wellbeing.
10. Psychological and Emotional Impact
While not a “physical” symptom in the traditional sense, the psychological effects of living with HS are deeply intertwined with the clinical presentation of this disease and deserve recognition as part of the overall symptom picture:
- Many patients experience anxiety and depression related to chronic pain, visible lesions, and unpredictable flares
- Body image issues are common, particularly when lesions appear in visible or sensitive areas
- Social isolation can result from embarrassment about odor, drainage, or the appearance of scars
- Reduced participation in physical activities, intimacy, and social events due to pain or self-consciousness
- Studies show that HS has a greater negative impact on quality of life than many other dermatological conditions, including psoriasis and eczema
Acknowledging the mental health burden of hidradenitis suppurativa is essential. Patients are encouraged to seek support from mental health professionals alongside dermatological care to address both the physical and emotional dimensions of this condition.
Main Causes of Hidradenitis Suppurativa
While the exact cause of HS is not fully understood, research points to several key contributing factors:
- Blocked hair follicles: HS begins when hair follicles become obstructed, leading to rupture and triggering an inflammatory immune response in the surrounding tissue.
- Immune system dysfunction: An overactive or dysregulated immune response plays a central role in the chronic inflammation characteristic of HS disease.
- Genetic predisposition: HS tends to run in families. Mutations in certain genes involved in hair follicle function (such as NCSTN, PSEN1, and PSENEN) have been identified in some HS patients.
- Hormonal influences: HS often begins after puberty and can worsen in relation to the menstrual cycle in women, suggesting hormones — particularly androgens — play a role in triggering flares.
- Obesity and metabolic factors: Excess body weight increases skin friction and is associated with higher levels of systemic inflammation, both of which can worsen HS symptoms.
- Smoking: Tobacco smoking is a well-established risk factor for HS. Nicotine affects follicular function and promotes inflammation, making smokers significantly more likely to develop and experience severe HS.
- Bacterial involvement: While HS is not an infection, bacteria (particularly Staphylococcus species) colonizing ruptured follicles can worsen inflammation and contribute to abscess formation.
How to Prevent Hidradenitis Suppurativa Flares
While there is currently no known cure for hidradenitis suppurativa, certain lifestyle measures may help reduce the frequency and severity of flares:
- Maintain a healthy weight: Reducing body weight lowers skin friction and systemic inflammation, which can help decrease the intensity of HS symptoms.
- Quit smoking: Stopping smoking is one of the most impactful lifestyle changes an HS patient can make. Studies show that quitting can significantly reduce flare frequency and severity.
- Wear loose-fitting, breathable clothing: Tight clothing increases friction and sweating in affected areas. Opt for soft, natural fabrics like cotton to minimize irritation.
- Practice gentle skin care: Use mild, non-irritating, fragrance-free cleansers on affected areas. Avoid harsh scrubbing, which can irritate already sensitive skin.
- Avoid shaving in affected areas: Shaving can traumatize hair follicles and trigger new lesions. Consider alternative hair removal methods after consulting with a dermatologist.
- Identify and manage triggers: Common personal triggers may include stress, dietary factors (some patients report that dairy or high-glycemic foods worsen their HS), heat, and excessive sweating. Keeping a symptom diary can help identify patterns.
- Manage stress: Psychological stress is known to trigger immune system activity. Techniques such as mindfulness, yoga, and regular exercise (within comfort limits) may help reduce stress-related flares.
- Seek regular medical follow-up: Consistent monitoring by a dermatologist allows for early intervention during flares and helps prevent the disease from progressing to more advanced stages. Always consult your doctor before starting any treatment plan.
Frequently Asked Questions (FAQ)
What is hidradenitis suppurativa (HS)?
Hidradenitis suppurativa is a chronic, inflammatory skin condition characterized by painful nodules, abscesses, and scarring in areas where skin rubs together. It is caused by blocked hair follicles combined with immune system dysfunction and is not contagious or caused by poor hygiene.
What are the first signs of hidradenitis suppurativa?
The earliest signs of HS typically include small, painful lumps or nodules under the skin, clustered blackheads, and a burning or itching sensation in commonly affected areas such as the armpits, groin, and inner thighs.
Is hidradenitis suppurativa contagious?
No. HS is not contagious and cannot be spread through contact. It is an immune-mediated condition with genetic and environmental components, not an infectious disease.
What causes hidradenitis suppurativa to flare up?
Common HS flare triggers include hormonal changes, stress, smoking, heat and sweating, friction from clothing, obesity, and potentially certain dietary factors. Triggers can vary significantly from person to person.
Can hidradenitis suppurativa go away on its own?
HS is a chronic condition that generally does not resolve on its own. However, some patients experience periods of remission (reduced symptoms). Without proper management, HS tends to progress over time, making early diagnosis and medical care important.
Who is most at risk for developing HS?
HS most commonly affects people between puberty and age 40, with women being diagnosed more often than men. Risk factors include a family history of HS, obesity, smoking, and having other inflammatory conditions such as Crohn’s disease or metabolic syndrome.
Should I see a doctor if I think I have HS?
Yes, absolutely. If you notice recurring painful lumps, abscesses, or scarring in skin fold areas, you should consult a dermatologist as soon as possible. Early diagnosis is key to preventing the disease from advancing to more severe stages. Always consult a qualified healthcare professional before taking any medication or starting any treatment.
References:
- Mayo Clinic – Hidradenitis Suppurativa: Symptoms & Causes
- American Academy of Dermatology (AAD) – Hidradenitis Suppurativa Overview
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) – Hidradenitis Suppurativa
- NHS UK – Hidradenitis Suppurativa
- StatPearls / NCBI – Hidradenitis Suppurativa