Dermatopathology -- Other general dermatologic terminology.
Plaque. A plaque is an elevated, solid, superficial lesion greater than half a 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 diameter.
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 a blister.
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 diameter.
Examples include bullous pemphigoid here on the left, bullous impetigo and pemphigus vulgaris.
Pustule. A pustule is a papule that contains purulent material.
Examples include acne and pustular psoriasis, also impetigo and follicullitis.
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.