| urticaria pigmentosa | The most common form of mastocytosis. It occurs primarily in children and is typically characterised by multiple persistent small, reddish-brown, hyperpigmented, pruritic macules and papules. They are located most commonly on the trunk, but seen also on the extremities, head, and neck. (12 Dec 1998) |
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| urticaria subcutanea | Urticaria in which itching is present without the wheals. (05 Mar 2000) |
| urticaria tuberosa | A vascular reaction involving the deep dermis or subcutaneous or submucal tissues, representing localised oedema caused by dilatation and increased permeability of the capillaries and characterised by development of giant wheals. (18 Nov 1997) |
| urticaria vesiculosa | An eruption of wheals capped with subepidermal vesicles. Synonym: urticaria vesiculosa. (05 Mar 2000) |