Cysts are pockets of tissue that can fill with fluid, pus, or hair. on the skin, they often appear as hard bumps, and they are usually caused by an infection or a blocked exocrine gland. most cysts resolve on their own, but some can cause complications.

This large cyst may press up against different nerve endings, causing pain or numbness. If a clogged gland causes it, that gland may not be able to release oil or sweat onto the skin, which is important for regulating temperature and keeping the skin waterproof.

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