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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]
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet. [4] They are more common in hairier areas, where in cases of long duration they could result in hair loss on the skin surface immediately above the cyst. They are smooth ...
Acne (/ˈækni/ ACK-nee), also known as acne vulgaris, is a long-term skin condition that occurs when dead skin cells and oil from the skin clog hair follicles. [10] Typical features of the condition include blackheads or whiteheads, pimples, oily skin, and possible scarring.
A pimple or zit is a kind of comedo that results from excess sebum and dead skin cells getting trapped in the pores of the skin. In its aggravated state, it may evolve into a pustule or papule . [ 1 ]
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.
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.
People with this type often have sensitive skin. Skin can also become very dry and flaky. In addition to the face, signs can also appear on the ears, neck, chest, upper back, and scalp. [22] Papulopustular rosacea presents with some permanent redness with red bumps (papules); some pus-filled pustules can last 1–4 days or longer.
The final structure of the abscess is an abscess wall, or capsule, that is formed by the adjacent healthy cells in an attempt to keep the pus from infecting neighboring structures. However, such encapsulation tends to prevent immune cells from attacking bacteria in the pus, or from reaching the causative organism or foreign object.