| A | B |
|---|
| macule | a small flat localized change in skin color (freckles) |
| wheal | accumulation of fluid in the papillary dermis may produce a localized elevation of the overlying epidermis (hives) |
| papule | a solid elevated area containing epidermal and papillary dermal components (mosquito or insect bite) |
| nodules | large papules that may extend into the subcutaneous layer (cyst) |
| vesicle | or blister, is a papule with a fluid core. A large vesicle may be called a bulla (2nd degree burn) |
| pustule | a papule sized lesion filled with pus (zit) |
| erosion | or ulcer, may occur following the rupture of a vesicle or pustule. Eroded sites have lost part or all of the normal epidermis (decubitis ulcer) |
| crust | an accumulation of dried sebum, blood, or interstitial fluid over the epidermis (sebborrheic dermatitis) |
| scales | form as a result of abnormal keratinization. They are thin plates of cornified cells. (psoriasis) |
| fissure | is a split in the integument that extends through the epidermis and into the dermis. (athlete's foot) |
