A cyst on the back is a common skin condition that often appears as a small, round lump beneath the surface of the skin. In many cases, these are known as epidermoid cysts, which form when skin cells move deeper into the skin and multiply rather than shedding off.
They are typically slow-growing, painless, and filled with a soft, cheese-like material made of keratin. While they can develop anywhere on the body, the back is one of the most frequent locations due to the higher number of oil glands and hair follicles in that area.
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