This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
Porokeratosis of Mibelli is a skin condition that usually develops in children or young adults. It begins as one or a few small, brownish bumps that grow into raised, bumpy patches. These patches slowly increase in size over time. The cause of this condition is unknown, though exposure to sunlight or other forms of radiation, genetic factors and a weakened immune system have been suggested as possible risk factors. Porokeratosis of Mibelli may sometimes harm normal tissue underlying the affected area; it may also develop into skin cancer. Treatment depends on the size, location, and aggressiveness of porokeratosis in each affected individual; it may include observation only, medication, or surgery.
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