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What are pustules? Pustules are small, pus-filled sores located at the surface of the skin. They are most commonly seen in acne, although they can be a sign of any infection involving the skin. Pustules appear on the skin as small, raised, reddened areas that typically have a whitish center.
Duodenoscopy image of hepatopancreatic ampulla with pus exuding from it, indicative of cholangitis. Pus is an exudate, typically white-yellow, yellow, or yellow-brown, formed at the site of inflammation during bacterial or fungal infection. An accumulation of pus in an enclosed tissue space is known as an abscess, whereas a visible collection of pus within or beneath the epidermis is known as a pustule, pimple, or spot.