A pustule is a small collection of pus in the top layer of skin (epidermis) or beneath it in the dermis.

A papule is similar, but does not contain pus. The term pimple is used to describe pustules and papules collectively.


Pustules frequently form in sweat glands or hair follicles. They form when clogged pores rupture under the surface. Usually found in oily areas. Also caused from clogged pores.

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