Dermatopathology -- Other general dermatologic terminology.
Plaque. A plaque is an elevated, solid, superficial lesion
greater than one centimeter in diameter.
Examples include psoriasis, Bowen’s disease, mycosis
fungiodes, eczema, and tinea corporis.
Patch. A patch is a flat skin discoloration.
A large macule is when it’s greater than one centimeter in
Examples are the nevus flammeus here on the left, and
vitiligo on the right.
Wheel. A wheel is a plaque that is evanescent, quickly
fading, and pruritic or itchy.
Examples are urticaria and dermatographia.
Vesicle. A vesicle is a papule that contains clear fluid or
Examples include herpes zoster on the left and herpes
simplex on the right.
Bulla. A bulla is a large vesicle with localized fluid
collection that is greater than half a centimeter in
Examples include bullous pemphigoid here on the left,
bullous impetigo and pemphigus vulgaris.
Pustule. A pustule is a papule that contains purulent
Examples include acne and pustular psoriasis, also impetigo
Cyst. A cyst is a nodule with fluid or semi solid material.
Examples include a epidermoid cyst on the left and cystic
acne on the right.