| Primary (Basic) Lesions Click name or picture for detailed information and images |
|
|---|---|
 macule |
circumscribed flat discoloration |
 papule |
elevated solid lesion (up to 5mm) |
 nodule |
palpable solid (round) lesion, deeper than a papule |
 plaque |
circumscribed, superficially elevated solid lesion (greater than 5 mm) (often, a confluence of papules) |
 wheal (hive) |
pale-red edematous plaque - round or flat-topped and transient |
 pustule |
elevated collection of purulence |
 vesicle |
circumscribed elevated collection of fluid (up to 5 mm in diameter) |
 bulla |
circumscribed elevated collection of fluid (greater than 5 mm in diameter) |
| Secondary (Sequential) Lesions Click name or picture for detailed information and images |
|
 scale (desquamation) |
excess dead epidermal cells |
 crust |
a collection of dried serum, blood, or purulence |
 erosion |
superficial loss of epidermis |
 ulcer |
focal loss of epidermis and dermis |
 fissure |
linear loss of epidermis and dermis |
 atrophy |
depression in the skin from thinning of epidermis and/or dermis |
 excoriation |
erosion caused by scratching |
 lichenification |
thickened epidermis with prominent skin lines (induced by scratching) |