Morphology

Front 1

macules

Back 1

small (<1cm), flat lesions. primary lesion in tinea versicolor. if you can feel it, then it is not a macule. usually caused by color changes in epidermis or upper dermis. indicates process is confined to epidermis. can have secondary changes such as scale or crust

Front 2

patch

Back 2

flat, larger than 1cm

Front 3

plaques

Back 3

large (>1cm), plateau-like, raised lesions. cast a shadow with side lighting. a proliferation of cells in epidermis or superficial dermis

Front 4

psoriasis

Back 4

primary lesion is a plaque. several 3-10cm bright pink round sharply circumscribed scaly plaques on extensor elbows, knees, lower back, and gluteal cleft

Front 5

papule

Back 5

raised lesion measuring <1cm. proliferation of cells in epidermis or superficial dermis

Front 6

nodule

Back 6

a larger, deep papule. a proliferation of cells down to the mid-dermis; overlying epidermis looks and feels normal, but proliferation of cells is in deeper tissues

Front 7

vesicles

Back 7

small, raised, fluid-filled lesions. primary lesion in shingles

Front 8

bulla

Back 8

large, fluid-filled blister (>1cm)

Front 9

pustule

Back 9

vesicle containing pus

Front 10

erosion

Back 10

a superficial loss of the epidermis. may occur after a vesicle forms and the top peels off. weeps and becomes crusted. a secondary change/characteristic

Front 11

ulcer

Back 11

erosion that involves the dermis. ulcers often heal with scarring; erosions usually do not.