Hidradenitis suppurativa (hi-drad-uh-NIE-tis sup-yoo-ruh-TIE-vuh) is a condition that causes small, painful lumps to form under the skin. The lumps usually develop in areas where your skin rubs together, such as the armpits, groin, buttocks and breasts. The lumps heal slowly, recur, and can lead to tunnels under the skin and scarring.

Hidradenitis suppurativa tends to start after puberty. It can persist for many years and worsen over time, with serious effects on your daily life and emotional well-being. Combined medical and surgical therapy can help manage the disease and prevent complications.

Symptoms
Hidradenitis suppurativa can affect one or several areas of the body. Signs and symptoms of the condition include:

Blackheads. Blackheads appear in small pitted areas of skin, often appearing in pairs.
Painful pea-sized lumps. The condition usually starts with a single, painful lump under the skin that persists for weeks or months. More bumps may form later, usually in areas where you have more sweat and oil glands or where the skin rubs together, such as the armpits, groin, buttocks and breasts.
Leaking bumps or sores. Some bumps or sores get bigger, break open and drain pus with an odor.
Tunnels. Over time, tunnels might form under the skin, connecting the lumps. These wounds heal very slowly, if at all, and drain blood and pus.
Some people with this condition experience only mild symptoms. The course of the disease is highly variable. Excess weight and being a smoker are associated with worse symptoms, but even people who are thin and don't smoke can experience severe disease.

When to see a doctor
Early diagnosis of hidradenitis suppurativa is key to getting effective treatment. See your doctor if your condition:

Is painful
Makes it difficult to move
Doesn't improve in a few weeks
Returns within weeks of treatment
Appears in several locations
Flares often
Hidradenitis suppurativa is not just a boil, and many people with this condition also have related conditions. People with hidradenitis suppurativa benefit from a health care team with medical and surgical dermatologists at the core. Other specialists are involved as needed.

Causes
Hidradenitis suppurativa develops when hair follicles become blocked. The exact cause for this isn't known. Experts think it could be connected to hormones, genetic predisposition, cigarette smoking or excess weight.

Hidradenitis suppurativa is not caused by an infection or being unclean, and it can't be spread to other people.

Risk factors
Factors that increase your chance of developing hidradenitis suppurativa include:

Age. The risk of hidradenitis suppurativa is higher for people in their 20s and 30s.
Sex. Females are more likely to develop hidradenitis suppurativa than are males.
Race. Ethnicity or race might affect risk level. In the United States, the condition's prevalence is disproportionately high among Black people.
Family history. A tendency to develop hidradenitis suppurativa can be inherited.
Certain conditions. Hidradenitis suppurativa is more common and severe in people who are overweight. It also has an association with severe acne, arthritis, diabetes, metabolic syndrome and inflammatory bowel disease.
Smoking. Smoking tobacco has been linked to hidradenitis suppurativa.
Complications
Persistent and severe hidradenitis suppurativa can cause complications, including:

Infection. The affected area is susceptible to secondary infection, but the presence of pus is common in hidradenitis suppurativa and doesn't necessarily mean infection.
Scars and skin changes. The wounds may heal but leave ropelike scars or pitted skin.
Restricted movement. Sores and scar tissue can cause limited or painful movement, especially when the disease affects the armpits or thighs.
Skin cancer. Squamous cell carcinoma has been reported with long-term hidradenitis suppurativa, particularly in people whose condition involves the perianal area.
Swelling in the arms, legs or genitals. The most common sites for hidradenitis suppurativa also contain many lymph nodes. Scar tissue can interfere with the lymph drainage system, which can result in swelling in the arms, legs or genitals.
Psychological effects and social isolation. The location, drainage and odor of the sores can cause embarrassment and reluctance to go out in public, leading to anxiety or depression.

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