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).
May appear anywhere on body.
May develop scale or crusts, or ulcerate.
Comment / Explanation
Inflammatory plaques often pruritic.
Psoriasis, sarcoidosis, plaque stage of mycosis fungoides (cutaneous T-cell lymphoma).
Inflammatory infiltrate, proliferations of cells, deposition of material.