| 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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| pars pigmentosa | pars pigmentosa |
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| retinitis pigmentosa | <ophthalmology> Disease caused by overactivity of the pigmented retinal epithelial cells, leading to damage and occlusion of photoreceptors and blindness. (18 Nov 1997) |
| morphea pigmentosa | Localised scleroderma in which there is an increase in pigmentation. (05 Mar 2000) |
| pseudoretinitis pigmentosa | A widespread pigmentary mottling of the retina that may follow severe eye trauma, especially from a penetrating injury. (05 Mar 2000) |
| dermatopathia pigmentosa reticularis | A persistent purplish network-patterned discoloration of the skin caused by dilation of capillaries and venules due to stasis or changes in underlying blood vessels including hyalinization; rarely appears as a developmental defect. Synonym: angiitis livedo reticularis, dermatopathia pigmentosa reticularis, livedo racemosa. (05 Mar 2000) |
| acute urticaria | Urticaria accompanied by slight constitutional symptoms. Synonym: acute urticaria, urticaria acuta, urticaria febrilis. (05 Mar 2000) |
| papular urticaria | A sensitivity reaction to insect bites, especially human and pet fleas, seen mostly in young children as wheals followed by papules on exposed areas. Synonym: lichen urticatus, prurigo infantilis, urticaria papulosa. (05 Mar 2000) |
| giant urticaria | 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) |
| vibratory urticaria | A form of urticaria that occurs in response to vibratory stimuli. (05 Mar 2000) |
| cholinergic urticaria | A form of physical or non-allergic urticaria initiated by heat (e.g., hot baths, physical exercise, pyrexia, exposure to sun or to a warm room) or by excitement; the rather distinctive lesions consist of pruritic areas 1 to 2 mm in diameter surrounded by bright red macules. Synonym: heat urticaria. (05 Mar 2000) |
| chronic urticaria | A form of urticaria in which the wheals recur frequently, or persist. Synonym: urticaria chronica. (05 Mar 2000) |
| cold urticaria | Wheal formation that develops after exposure to lowered temperatures, with or without demonstrable passive-transfer antibodies. Synonym: congelation urticaria. (05 Mar 2000) |
| congelation urticaria | Wheal formation that develops after exposure to lowered temperatures, with or without demonstrable passive-transfer antibodies. Synonym: congelation urticaria. (05 Mar 2000) |
| pressure urticaria | Urticaria of unknown aetiology occurring after local pressure on the skin. (05 Mar 2000) |
| heat urticaria | A form of physical or non-allergic urticaria initiated by heat (e.g., hot baths, physical exercise, pyrexia, exposure to sun or to a warm room) or by excitement; the rather distinctive lesions consist of pruritic areas 1 to 2 mm in diameter surrounded by bright red macules. Synonym: heat urticaria. (05 Mar 2000) |