A pustule is a small collection of pus in the top layer of skin (epidermis) or beneath it in the dermis. Pustules frequently form in sweat glands or hair follicles. Pus is a mixture of inflammatory cells and liquid. Put somewhat more simply, a pustule is a little pocket full of pus.

A lesion on the skin that is filled with pus

late 14c., from Old French pustule (13c.) and directly from Latin pustula "blister, pimple," from PIE imitative root *pu- (1) "blow, swell," on notion of "inflated area" [..]

A small inflammation of the skin, containing pus.

a spot on the skin that is filled with liquid

Small blisterlike elevation of epidermis from which spores emerge.

[Indumentum (hairs, etc.)] -- Raised bump or wart-like spot.

(n) a small inflamed elevation of skin containing pus; a blister filled with pus

A small elevation of the skin filled with a white substance.

circumscribed, elevated whitish or pinkish skin lesions that contain pus

Also called Pimple, is an inflamed lesion on the skin that resembles a pink bump. Please contact a dermatologist for this type of acne treatment.