Urticaria pigmentosa

Urticaria pigmentosa
Other namesGeneralized eruption of cutaneous mastocytosis (childhood type)
The back of a child with urticaria pigmentosa
SpecialtyMedical genetics 

Urticaria pigmentosa (also known as generalized eruption of cutaneous mastocytosis (childhood type):616 ) is the most common form of cutaneous mastocytosis. It is a rare disease caused by excessive numbers of mast cells in the skin that produce hives or lesions on the skin when irritated.