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If the pore closes, it'll appear white and is called a whitehead; if the pore remains open it looks dark and is called a blackhead. First thing's first: Acne as a whole is extremely common.
“Whiteheads are a type of acne known as a closed comedone, meaning that oil and/or dead skin has blocked a hair follicle or pore and created a closed bump on the skin and they can appear whitish ...
When pores get clogged, it causes red lesions — which you know as pimples — to form on the face or other areas of the body, especially those with the most oil glands, like the back, shoulders ...
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]
Comedones (blackheads and whiteheads) must be present to diagnose acne. In their absence, an appearance similar to that of acne would suggest a different skin disorder. [29] Microcomedones (the precursor to blackheads and whiteheads) are not visible to the naked eye when inspecting the skin and require a microscope to be seen. [29]
Relative incidence of cutaneous cysts. Milia is labeled at bottom right.. A milium (pl.: milia), also called a milk spot or an oil seed, [1] is a clog of the eccrine sweat gland.