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Urticaria pigmentosa is characterized by excessive amounts of mast cells in the skin. Red or brown spots are often seen on the skin, typically around the chest, forehead, and back. These mast cells, when irritated (e.g. by rubbing the skin, heat exposure), produce too much histamine, triggering an allergic reaction that leads to hives localized ...
Medical genetics. Named after. Donovan James McCune. Fuller Albright. McCune–Albright syndrome is a complex genetic disorder affecting the bone, skin and endocrine systems. It is a mosaic disease arising from somatic activating mutations in GNAS, which encodes the alpha-subunit of the G s heterotrimeric G protein. [ 1]
Stevens–Johnson syndrome (SJS) is a type of severe skin reaction. [1] Together with toxic epidermal necrolysis (TEN) and Stevens–Johnson/toxic epidermal necrolysis (SJS/TEN) overlap, they are considered febrile mucocutaneous drug reactions and probably part of the same spectrum of disease, with SJS being less severe.
Notalgia paresthetica is a common localized itch, affecting mainly the area between the shoulder blades (especially the T2 – T6 dermatomes) but occasionally with a more widespread distribution, involving the shoulders, back, and upper chest. [ 2]: 402 The characteristic symptom is pruritus ( itch or sensation that makes a person want to ...
Hyperpigmentation can be diffuse or focal, affecting such areas as the face and the back of the hands. Melanin is produced by melanocytes at the lower layer of the epidermis. Melanin is a class of pigment responsible for producing color in the body in places such as the eyes, skin, and hair. The process of melanin synthesis (melanogenesis ...
Mongolian spot is a congenital developmental condition—that is, one existing from birth—exclusively involving the skin. The blue colour is caused by melanocytes, melanin -containing cells, that are usually located in the surface of the skin (the epidermis ), but are in the deeper region (the dermis) in the location of the spot. [ 6]
Melasma. Melasma (also known as chloasma faciei, [ 1]: 854 or the mask of pregnancy[ 2] when present in pregnant women) is a tan or dark skin discoloration. Melasma is thought to be caused by sun exposure, genetic predisposition, hormone changes, and skin irritation. [ 3]
Keratosis pilaris. Keratosis pilaris ( KP; also follicular keratosis, lichen pilaris, or colloquially chicken skin[ 1]) is a common, autosomal - dominant, genetic condition of the skin's hair follicles characterized by the appearance of possibly itchy, small, gooseflesh -like bumps, with varying degrees of reddening or inflammation. [ 2]