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Flat pigmented circumscribed area less than 1 cm in diameter.
Example: freckle, flat mole, or rash that occurs in rubella
Solid, elevated lesion less than 1 cm in diameter that may be the same color as the skin or pigmented. Examples: nevus, wart, pimple, ringworm, psoriasis
Palpable, circumscribed lesion, larger and deeper than a papule (up to 2 cm) extends into the dermal area. Example: intradermal nevus, benign or malignant tumor.
Solid, elevated lesion larger than 2 cm in diameter that extends into the dermal and subcutaneous layers. Example: lipoma, steatoma, dermatofibroma, hemangioma
Elevated, firm, rounded lesion with localized skin edema (swelling) that varies in size, shape, and color; paler in the center than it's surrounding edges; accompanied by itching. Examples: Hives, insect bites
Elevated, circumscribed, fluid-filled lesion less than 0.5 cm in diameter. Example: poison ivy, shingles
Small, raised circumscribed lesion that contains pus, usually less than 1 cm in diameter. Examples: acne, furuncle, pustular psoriasis, scabies
Bulia (fluid filled)
A vesicle or blister larger than 2 cm in diameter. Examples: second degree burns, severe poison oak, poison
Excoriations (secondary, depressed lesions)
Linear scratch marks or traumatized abrasions of the epidermis. Examples: scratches, abrasions, chemical or thermal burns
Fissure (secondary lesions, depressed lesions)
Small slit or crack like sore that extends into the dermal layer, could be caused by continuous inflammations and drying.
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