parapsoriasis

A heterogenous group of skin disorders unrelated to psoriasis, including pityriasis lichenoides and small and large plaque p..

- p. en plaque a form of large plaque p. in middle age that frequently develops into mycosis fungoides. Affecting the trunk and proximal extremities, the lesions exceed 5 cm in diameter and are often symmetric. Small plaques p. en plaque is a benign variant, also called digitate dermatosis.

- p. guttata SYN: pityriasis lichenoides.

- p. lichenoides SYN: poikiloderma atrophicans vasculare.

- p. lichenoides et varioliformis acuta SYN: pityriasis lichenoides et varioliformis acuta.

- small plaque p. SYN: digitate dermatosis.

- p. varioliformis SYN: pityriasis lichenoides et varioliformis acuta.

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para·pso·ri·a·sis -sə-'rī-ə-səs n, pl -a·ses -.sēz a rare skin disease characterized by red scaly patches similar to those of psoriasis but causing no sensations of pain or itch

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n.

a former name for the earliest phase of mycosis fungoides.

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para·pso·ri·a·sis (par″ə-sə-riґə-sis) pl. parapsoriґases [para- + psoriasis] any of a group of slowly evolving erythrodermas, all characterized by scaling, resistance to treatment, and chronicity; it includes the forms of pityriasis lichenoides as well as large plaque and small plaque parapsoriases.