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Adult :: Male :: Armpit

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The pictures below demonstrate conditions that can affect the armpit in adults. Because the skin of the armpit is folded over on itself and has a high number of sweat glands, it is unique to other areas of the body. This can lead to infections such as folliculitis, an infection of hair follicles, which may require antibiotics or drainage of an abscess. Rashes under the armpit are often caused by deodorants or detergents and lead to a condition known as irritant contact dermatitis or allergic contact dermatitis. Sometimes the skin of the armpit can darken, known as acanthosis nigrans, which is a darkening to the skin that occurs most often in obese people but can be due to some medications (eg, steroids). Erythrasma is another condition that darkens the skin, and it is caused by bacteria, most often in those who are obese or have diabetes.

Abscess An abscess is a infection characterized by a collection of pus underneath a portion of the skin. Bacteria commonly causing abscesses are Staphylococcus aureus and Streptococcus. These bacteria enter the…

Acanthosis Nigricans Acanthosis nigricans is a condition characterized by abnormal thickening and darkening of the skin, especially in body creases. It is most commonly associated with obesity or polycystic ovarian disease in…

Allergic Contact Dermatitis Allergic contact dermatitis is a delayed hypersensitivity reaction (the reaction to the allergen occurs 48–72 hours after exposure). The most common allergens causing allergic contact…

Boils (Furunculosis) Boils (furuncles) are painful pus-filled bumps on the skin resulting from the deep infection of a hair follicle. The infection is usually caused by a type of bacteria called Staphylococcus aureus…

Erythrasma Erythrasma is a common chronic skin condition affecting the skin folds. The slowly enlarging patches of pink to brown dry skin are caused by an infection by the bacterium Corynebacterium minutissimum.

Intertrigo Intertrigo is irritation of touching skin surfaces in body fold regions (armpits, under the breasts, belly, buttocks, groin, and sometimes between fingers or toes). Intertrigo can be worsened by…

Irritant Contact Dermatitis Irritant contact dermatitis is an inflammatory rash caused by direct chemical injury to the skin. Unlike allergic contact dermatitis, which appears 48–72 hours after exposure to an allergen, the…

Psoriasis Psoriasis is a non-contagious, lifelong skin problem with thickened red, and often scaly, skin. It is very likely to run in families (hereditary) and seems to be caused by…

Melanoma Melanoma is a life-threatening form of skin cancer. This cancer starts in the color-producing (pigment-producing) cells of the skin. Melanoma may develop from a previously existing mole…

Mole (Nevus) A mole (nevus) is a non-cancerous (benign) skin lesion that is made up of the color-producing (pigment-producing) cells of the skin (melanocytes). A mole that is present at birth is referred to as a…

Mole, Atypical (Atypical Nevus) Atypical moles (atypical nevi) or dysplastic moles (dysplastic nevi), are caused by collections of the color-producing (pigment-producing) cells of the skin (melanocytes) in which the cells grow…

Ringworm (Tinea Corporis) Tinea infections are commonly called ringworm because some may form a ring-like pattern on affected areas of the body. Tinea corporis, also known as ringworm of the body, tinea circinata, or simply…

Skin Tag (Acrochordon) A skin tag (acrochordon) is a common, possibly inherited condition that manifests as small, flesh-colored growths on a thin stalk. Skin tags are benign lesions that can sometimes become irritated or…