What Causes Hidradenitis Suppurativa? Genetics, Hormones and Triggers

What causes hidradenitis suppurativa is a question that comes with a lot of guilt attached, because many people assume they did something wrong. You did not. HS is a chronic inflammatory disease, and the roots are mostly biological. Here is what researchers think is going on.

What actually happens inside the skin?

The current model goes like this. A hair follicle in a skin-fold area gets plugged. It swells, can rupture, and spills keratin and bacteria into the surrounding skin. The immune system reacts strongly, causing a painful, deep lump.

In people with HS, the inflammatory response appears to be overactive. Molecules such as TNF-alpha and interleukin-17 are thought to play a part, which is why biologics that block them can work.

Is HS genetic?

Often, yes. Many people with HS have a close relative with the condition, and some families carry mutations in genes related to the gamma-secretase pathway. Most people, though, do not have a single identified gene. Having a family member with HS raises your risk, but it does not guarantee you will get it.

What role do hormones play?

HS typically starts after puberty, and many women notice flares before periods. It can change during pregnancy and after menopause. These patterns suggest hormones influence inflammation in follicles, though the exact mechanism is not settled.

Because of this link, some doctors consider spironolactone or hormonal contraceptives for women whose flares follow their cycle.

How do smoking and weight affect it?

• Smoking. Current or past smoking is much more common among people with HS, and smokers often have more severe disease. Quitting is associated with better outcomes.
• Body weight. Higher body mass index is associated with higher risk and severity, likely from friction, hormones, and inflammation. Many people with HS are slim, so weight is a risk factor, not a cause.

What does NOT cause HS?

This is the part many people need to hear.

• Poor hygiene. HS happens in people who wash carefully.
• Deodorant or antiperspirants. They may irritate, but they do not cause it.
• Shaving. It can trigger flares in the area, but does not create the condition.
• An infection that you can pass on. See whether HS is contagious for the full answer.
• Sexual activity or STIs.

What are known risk factors and triggers?

Related conditions also show up more often with HS, including acne, metabolic syndrome, polycystic ovary syndrome, inflammatory bowel disease, and arthritis. Your doctor may ask about these.

Does knowing the cause change treatment?

A little, yes. If inflammation is the driver, anti-inflammatory and immune-targeting drugs make sense. If follicle blockage plays a big role, keratolytics such as resorcinol help early lumps. If bacteria add fuel, antibiotics help.

That is the logic behind Vuret's HS Flare Control Cream, which pairs resorcinol 15% and clindamycin 1%. It is compounded and not FDA-approved, and it fits mild to moderate disease. Our guides on resorcinol and clindamycin explain each ingredient.

What can you control?

1. Quit smoking if you smoke.
2. Reduce friction and heat in problem areas.
3. Consider weight management if it applies to you.
4. Track hormonal patterns and bring them to your doctor.
5. Treat early, before scarring starts. See the Hurley stages to understand why.

Why does HS take so long to get diagnosed?

Studies have found delays of several years, on average, between the first symptoms and a diagnosis. The reasons are simple: early HS looks like boils, cysts, or ingrown hairs, and many people feel too embarrassed to bring up lumps in the groin or buttocks. Doctors who do not see HS often may also treat each lump as a separate event.

If you recognize the pattern in yourself, saying "I think this might be hidradenitis suppurativa" at your appointment can speed things up. Our guides to boils and cysts show the differences.

What does the science still not know?

Researchers are still working out why some people with the same risk factors develop severe disease and others stay mild. The role of the skin microbiome, the exact genes involved, and how hormones interact with the immune response are all active areas of study. New drugs, such as secukinumab and bimekizumab, came out of that research, which is a good sign for the future.

For you today, the practical takeaway is that HS is real, biological, and treatable, and that it is not your fault. You do not have to wait for the science to be settled to start doing something about it.

Are other conditions linked to HS?

Yes. HS is linked with obesity, metabolic syndrome, type 2 diabetes, polycystic ovary syndrome, inflammatory bowel disease (especially Crohn's disease), spondyloarthritis, and depression and anxiety. These links reflect shared inflammation and shared risk factors, not that one causes the other directly.

Ask your doctor to check blood pressure, blood sugar, and cholesterol if you have HS, and to screen for mood symptoms. Treating the whole picture often helps your skin too.

Should you get genetic testing?

For most people, no. Genetic testing for HS is rarely done outside of research or unusual family patterns, because most cases do not trace back to one gene. Your family history and your own pattern of symptoms tell your doctor far more than a test would, and the result would rarely change your treatment.

If several relatives have severe HS, mention it to your dermatologist. It may point toward earlier or more active treatment, and it is useful information for relatives who are starting to notice lumps of their own.

If your lumps are mild to moderate and you want to treat them, start an online visit on the Vuret HS page. Also see the best HS treatments for the wider picture.