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A comedo may be open to the air ("blackhead") or closed by skin ("whitehead"). [2] Being open to the air causes oxidation of the melanin pigment, which turns it black. [9] [2] Cutibacterium acnes is the suspected infectious agent in acne. [3] It can proliferate in sebum and cause inflamed pustules (pimples) characteristic of acne. [3]
Papules and pustules with no true comedones are mostly found on the trunk and back. Nodulocystic lesions are uncommon. In contrast to acne, these lesions can appear anywhere on the body, not just on the face. When the cause is a drug eruption, the individual will usually specify that the lesions go away once the medication is stopped.
Whiteheads form when oil or dead skin blocks a hair follicles or pores and creates closed bumps on the skin that can appear white or yellow. Here's how to get rid of them.
Folliculitis is the infection and inflammation of one or more hair follicles.The condition may occur anywhere on hair-covered skin.The rash may appear as pimples that come to white tips on the face, chest, back, arms, legs, buttocks, or head.
Symptoms can range from looking like a pimple that doesn’t heal to a shiny, skin-colored bump, a white or waxy lesion, a flat, scaly patch or a lesion that is black, brown or blue.
The lesions are usually, polymorphic, meaning they can take many forms, including open or closed comedones (commonly known as blackheads and whiteheads), papules, pustules, and even nodules or cysts so that these lesions often leave behind sequelae, or abnormal conditions resulting from a previous disease, such as scarring or hyperpigmentation ...
The best way to combat blackheads and whiteheads is to know which one you're dealing with. Find out how to tell the difference between blackheads and whiteheads, plus how to treat both types of acne.
Pustule: A pustule is a small elevation of the skin usually consisting of necrotic inflammatory cells. [30] Cyst: A cyst is an epithelial-lined cavity. [10] Wheal: A wheal is a rounded or flat-topped, pale red papule or plaque that is characteristically evanescent, disappearing within 24 to 48 hours.