Medical Integumentary System

Crust

Dry pus or blood covering an injury; such as a scab

Macule

Flat, discolored spot on the skin; such as a freckle

Wheal

Itchy, raised area with an irregular shape; such as a hive

Ulcer

Open sore with deep loss of skin surface

Pustule

Pus-filled, raised sac; such as acne

Vesicle

Raised, fluid-filled sac; such as a blister

Papule

Raised, solid area less than 1 cm in diameter