Plaque

Sinonimai

Plaque

Definition/Description

A palpable, flat-topped, firm, rough, superficial lesion elevated above the skin surface, larger than a papule; papules can coalesce to form plaques
Colors: if caused by inflammation, then red; if secondary to other deposits, then red, brown or yellow
Size: > 1 cm (up to 10-20cm)

Localization

May appear anywhere on body.

Eiga

May develop scale or crusts, or ulcerate.

Comment / Explanation

Inflammatory plaques often pruritic.

Typical Dermatoses

Psoriasis, sarcoidosis, plaque stage of mycosis fungoides (cutaneous T-cell lymphoma).

Pathophysiology

Inflammatory infiltrate, proliferations of cells, deposition of material.

1.4 Plaque