Melanosis is a form of hyperpigmentation associated with increased melanin.It can also refer to:

Melanism
Ocular melanosis
Smokers melanosis
Oral melanosis
Riehl melanosis

See also
List of cutaneous conditions

References


== External links ==
Physical urticaria is a distinct subgroup of the urticaria that are induced by an exogenous physical stimulus rather than occurring spontaneously. There are seven subcategories that are recognized as independent diseases. Physical urticaria is known to be painful, itchy and physically unappealing; it can recur for months to years of a persons life. Signs and symptoms
Urticaria are characterized by dermal edema (wheal, swollen) and erythema (flare, red), also known as hives. Hive lesions typically last less than 24 hours and are usually itchy (pruritic). Hives can appear anywhere on the body and they may change shape, move around, disappear and reappear over short periods of time. Types of hives
Acute urticaria (short-term): can develop suddenly and will last less than 6 weeks. About 1 in 6 people will have acute hives at one point in their life.Chronic urticaria (long-term): can develop suddenly and will persist more than 6 weeks. This type of urticaria is uncommon and occurs in only 0.1% of the population. 20% of people with chronic urticaria report still having problems 10 years after its onset. Causes
The cause of physical urticaria is unknown but it has been suggested to be an autoimmune disease.