Hidradenitis suppurativa signs and symptoms

HS usually begins with deep, tender nodules beneath the skin. Unlike superficial pimples, these lumps sit deeper in the tissue and cause significant discomfort or pain. They often persist for days or weeks and may not fully disappear before new lesions develop nearby. Inflammation around blocked hair follicles drives the formation of these nodules. 

As inflammation increases, nodules can enlarge and fill with fluid or pus, forming abscesses. These lesions often become intensely painful and may rupture on their own. When they drain, they release fluid that can have an unpleasant smell and may contain blood or a cloudy discharge. Repeated swelling and drainage can weaken the surrounding skin and increase sensitivity. 

Long-standing inflammation can lead to the development of tunnels beneath the skin surface, known as sinus tracts. These channels connect individual lesions and can remain present even when the skin looks less inflamed. Sinus tracts may leak fluid from time to time and often signal more advanced HS. Many people describe them as deep, cord-like structures or hollow spaces under the skin. 

Repeated cycles of inflammation, rupture, and healing frequently lead to scarring. Over time, affected skin may thicken and develop firm, fibrous tissue that changes its texture and appearance. Scarring can restrict movement, particularly in areas such as the armpits or groin, where stretching and friction occur regularly. 

Some individuals with HS notice small, dark bumps that resemble blackheads. These often appear in pairs and reflect blocked hair follicles. While blackhead-like lesions can occur early in the disease, they usually appear alongside deeper inflammatory changes rather than as isolated skin findings. 

Pain is one of the most challenging symptoms of hidradenitis suppurativa. People describe sensations ranging from burning and pressure to sharp or throbbing pain, which can worsen with movement or friction. Itching also affects many individuals and may intensify before new lesions appear. Together, pain and itching can interfere with sleep, mobility, and daily activities. 

Fluid that drains from abscesses or sinus tracts often produces a strong odour. This smell develops as proteins in the discharge break down in warm, moist areas of the skin. Although it does not pose a health risk, it can cause embarrassment and contribute to social withdrawal and emotional distress. 

HS affects more than the skin. Chronic pain, visible lesions, and persistent drainage can lead to anxiety, low mood, and reduced self-confidence. Many people struggle with disrupted sleep, difficulty working, or they avoid social situations. The unpredictable pattern of flare-ups adds further emotional strain, particularly when symptoms interfere with daily plans or relationships.