<unk>  is a chronic blockage of the sweat gland ducts with a secondary, non-bacterial inflammatory response to the secretions and cellular debris in the cysts. The inflammation is often accompanied by intense itching. In general, the disease often causes skin to darken near the affected area and raised bumps or papules to appear. In addition, hair follicles can become damaged which cause hair loss. Hidradenitis is very similar, but tends to have a secondary bacterial infection so that pus-draining sinuses are formed. It is a very devastating skin disease that does not have universally curative treatments.
Fox–Fordyce disease
Degos disease
Pott disease
Ollier disease
Letterer–Siwe disease
Cruveilhier–Baumgarten disease
Brill–Zinsser disease
Salla disease