| pityriasis rubra | Generalised exfoliation with scaling of the skin and usually with erythema (erythroderma); may be a drug reaction or associated with various benign dermatoses, lupus erythematosus, lymphomas, or of undetermined cause. Synonym: dermatitis exfoliativa, pityriasis rubra, Wilson's disease. (05 Mar 2000) |
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| pityriasis rubra pilaris | A chronic skin disease characterised by small follicular papules, disseminated reddish-brown scaly patches, and often, palmoplantar hyperkeratosis. The papules are about the size of a pin and topped by a horny plug. (12 Dec 1998) |
| pityriasis sicca | <dermatology> Dried skin that flakes free from the scalp. (27 Sep 1997) |