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Melanonychia is a black or brown pigmentation of a nail, and may be present as a normal finding on many digits in Afro-Caribbeans, as a result of trauma, systemic disease, or medications, or as a postinflammatory event from such localized events as lichen planus or fixed drug eruption. [1]: 790 [2]: 665. There are two types, longitudinal and ...
Acral lentiginous melanoma. Acral lentiginous melanoma is a type of skin cancer. [6] It typically begins as a uniform brownish mark before becoming darker and wider with a blurred irregular edge, most frequently seen in the foot of a person with darker skin. [6] It may become bumpy and ulcerate. [6]
There are several causes of Beau's lines. It is believed that there is a temporary cessation of cell division in the nail matrix.This may be caused by an infection or problem in the nail fold, where the nail begins to form, or it may be caused by an injury to that area.
Causes. Mees' lines can look similar to injury to the nail, which should not be confused with true Mees' lines. [1] Mees' lines appear after an episode of poisoning with arsenic, [2] thallium or other heavy metals or selenium, [3] opioid MT-45, and can also appear if the subject is suffering from kidney failure. [4]
Melanocytes are melanin -producing neural crest -derived [3] cells located in the bottom layer (the stratum basale) of the skin's epidermis, the middle layer of the eye (the uvea), [4] the inner ear, [5] vaginal epithelium, [6] meninges, [7] bones, [8] and heart found in many mammals and birds. [9] Melanin is a dark pigment primarily ...
Hormones and certain medications can also make pigmented bands in the nails, but be especially watchful for nail cancer symptoms, such as a brown or dark stripe that goes from the cuticle out to ...
A nail disease or onychosis is a disease or deformity of the nail. Although the nail is a structure produced by the skin and is a skin appendage, nail diseases have a distinct classification as they have their own signs and symptoms which may relate to other medical conditions. Some nail conditions that show signs of infection or inflammation ...
Dysplastic nevus syndrome, also known as familial atypical multiple mole–melanoma (FAMMM) syndrome, is an inherited cutaneous condition described in certain families, and characterized by unusual nevi and multiple inherited melanomas. [2][3] First described in 1820, the condition is inherited in an autosomal dominant pattern, and caused by ...