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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 ...
Freckle. Freckles are clusters of concentrated melaninized cells which are most easily visible on people with a fair complexion. Freckles do not have an increased number of the melanin-producing cells, or melanocytes, but instead have melanocytes that overproduce melanin granules ( melanosomes) changing the coloration of the outer skin cells ...
Schamberg's disease, or progressive pigmented purpuric dermatosis, is a chronic discoloration of the skin which usually affects the legs and often spreads slowly. This disease is more common in males and may occur at any age from childhood onward. This condition is observed worldwide and has nothing to do with race or ethnic background.
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]
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]
Café au lait spots, or café au lait macules, are flat, hyperpigmented birthmarks. [ 1] The name café au lait is French for "coffee with milk" and refers to their light-brown color. They are caused by a collection of pigment-producing melanocytes in the epidermis of the skin. [ 2] These spots are typically permanent and may grow or increase ...
Specialty. Dermatology, hematology. Purpura ( / ˈpɜːrpjʊərə / [ 1]) is a condition of red or purple discolored spots on the skin that do not blanch on applying pressure. The spots are caused by bleeding underneath the skin secondary to platelet disorders, vascular disorders, coagulation disorders, or other causes. [ 2]
Melanism. Melanistic black eastern grey squirrel ( Sciurus carolinensis) Melanistic guinea pigs ( Cavia porcellus) are rare, and are used in rituals by Andean curanderos. [ 1] Melanism is the congenital excess of melanin in an organism resulting in dark pigment . Pseudomelanism, also called abundism, is another variant of pigmentation ...
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