Is rare, long-term skin condition that features small, painful lumps under the skin. They typically develop where the skin rubs together, such as the armpits, the groin, between the buttocks and under the breasts. The lumps may break open and smell or cause tunnels under the skin.
Blackheads. Small pitted areas of skin containing blackheads — often appearing in pairs or a "double-barreled" pattern — are a common feature.
Red, tender bumps. These bumps often enlarge, break open and drain pus. The drainage may have an odor. Itching and burning may accompany the bumps. They usually appear in areas where skin rubs against skin.
Painful, pea-sized lumps. These hard lumps, which develop under the skin, may persist for years, enlarge and become inflamed.
Tunnels. Over time, tracts connecting the lumps may form under the skin. These wounds heal very slowly, if at all, and can leak pus.