Terms Used in Skin Diseases and their Definitions:-
Macule- Small flat area of altered color or texture
Papule- Small solid elevation of skin, less than .5 cm in diameter
Nodule- A solid mass in skin, greater than .5 cm in diameter
Plaque- Elevated area of skin greater than 2 cm in diameter but without substantial depth
Vesicle- Circumscribed elevation of skin , less than .5 cm in diameter and containing fluid
Bulla- Circumscribed elevation of skin over .5 cm in diameter and containing fluid
Pustule- A visible accumulation of pus in skin
Abscess- A localized collection of Pus in a cavity. More than 1 cm in diameter
Wheal- An elevated white compressible , evanescent area produced by dermal edema
Papilloma- A nipple like mass projecting from skin
Petechiae- Pinhead size macules due to bleeding in skin
Purpura- Large area of bleeding in skin
Ecchymosis- A larger extravasation of blood into skin
Hematoma- A swelling from gross bleeding
Burrow- A linear or curvilinear papule, caused by a burrowing scabies mite
Comedo- A plug of keratin and Sebum wedged in a dilated pilosebaceous orifice
Telangiectasia- The visible dilation of small cutaneous blood vessels
Scale- A flake rising from the horny layer
Crust – Looks like a scale but is composed of dried blood or tissue fluid
Erosion- An area of skin denuded by a complete or partial loss of the Epidermis
Ulcer- An area of skin from which the whole of the epidermis ( Uppermost layer of skin) and at least the upper part of Dermis ( Inner layer of skin below epidermis) is lost
Excoriation- An ulcer or erosion produced by scratching
Fissure- A slit in the skin
Sinus- A cavity or channel that permits the escape of pus or fluid
Scar- The result of healing in which normal structures are permanently replaced by fibrous tissue
Atrophy- Thinning of skin due to diminution of the epidermis ,dermis, subcutaneous fat
Stria - A streak like linear, atrophic, pink, purple or white lesion of the skin due to changes in the connective tissue