Patient Information Leaflets (PILs)
These Patient Information Leaflets (PILs) are specially written by the British Association of Dermatologists (BAD).
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There are thousands of different skin complaints, therefore, the focus of the British Association of Dermatologists' PILs production is on the most common, rarest or debilitating skin conditions.
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Urticaria pigmentosa is the commonest type of a group of diseases called cutaneous mastocytosis, which has 3 other different types (see ‘What are the symptoms of urticaria pigmentosa?’ section).
Mastocytosis means increased number of mast cells. Mast cells are a type of blood cell belonging to our immune system, which secrete histamine if triggered. They can exist in the blood vessels or in any body tissue or organ. Urticaria pigmentosa is composed of pigmented brown patches, made of collections of mast cells that swell when rubbed similar to urticaria. In the majority of cases, urticaria pigmentosa is a harmless condition with excellent outcome.
More than 75% of cases of urticaria pigmentosa happen to infants and children less than 10 years old, but it can also affect older children and adults. It affects both sexes equally and occurs in all races equally.