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Dermatosis papulosa nigra (DPN) is a condition of many small, benign skin lesions on the face, a condition generally presenting on dark-skinned individuals. [1]: 638–9 DPN is extremely common, affecting up to 30% of Black people in the US. [2] From a histological perspective, DPN resembles seborrheic keratoses. [3]
AKN is characterized by firm pink, flesh-colored or hyperpigmented bumps in the skin, which are usually located on the back of the head or neck. This is mainly because men often cut their hair very low as opposed to women, allowing the hair to prick the occipital scalp thereby causing irritation.
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Lichen sclerosus (LS) is a chronic, inflammatory skin disease, of unknown cause, which can affect any body part of any person, but has a strong preference for the genitals (penis, vulva), and is also known as balanitis xerotica obliterans when it affects the penis. Lichen sclerosus is not contagious.
It was first reported by French dermatologist Ferdinand-Jean Darier in 1889. Mild forms of the disease are the most common, consisting of skin rashes that flare up under conditions such as high humidity, high stress, or tight-fitting clothes.
The Fitzpatrick scale has been criticized for its Eurocentric bias and insufficient representation of global skin color diversity. [9] The scale originally was developed for classifying "white skin" in response to solar radiation, [2] and initially included only four categories focused on white skin, with "brown" and "black" skin types (V and VI) added as an afterthought.
The skin weighs an average of four kilograms, covers an area of two square metres, and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. [1] The two main types of human skin are: glabrous skin, the hairless skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [3]
The only sign of vitiligo is the presence of pale patchy areas of depigmented skin which tend to occur on the extremities. [7] [8] Some people may experience itching before a new patch appears. [9] The patches are initially small, but often grow and change shape. [7] [10] When skin lesions occur, they are most prominent on the face, hands and ...