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What is hidradenitis suppurativa? Hidradenitis suppurativa (say "hih-drad-uh-NY-tus sup-yur-uh-TY-vuh") is a skin condition that causes lumps on the skin that look like pimples or boils. It can come and go for many years. Doctors don't know exactly how this skin problem starts. But they do know that something irritates...