Primary Skin Lesions:

Macule: colored lesion, not raised (<2cm in diameter).

Patch: differs from macule only in size (>2cm).

Papule: raised solid lesion (<1cm), palpable.

Nodule: differs with papule only in size (>1cm to 5cm)

Tumor: firm, solid, raised growth (>5cm).

Plaque: flat-topped raised lesion (>1cm), with distinct edges or blending with normal skin.

Vesicle: fluid-filled, raised lesion (<1cm in diameter).

Bulla: fluid-filled raised lesion (>1cm in diameter).

Pustule: vesicle filled with leukocytes.

Cyst: soft, raised lesion filled with semi-solid or liquid contents.

Wheal: raised, erythematous papule or plaque (short-lived dermal edema).

Telangiectasia: dilated, superficial blood vessels.

Sequential Skin Lesions:

Lichenification: a distinctive thickening of the skin, with accentuated skin folds.

Crust: dried exudate of body fluids (yellow= serous, red=hemorrhagic).

Millia: small, firm, white papules, filled with keratin (resemble pustules).

Erosion: epithelial deficit (results in a superficial disruption of the skin integrity).

Ulcer: epithelial deficit (resulting in a deep surface disruption).

Excoriations: linear, angular erosions that may be covered by a crust (usually caused by scratching).

Atrophy: loss of substance of the skin.

Scar: change secondary to trauma or inflammation (erythematous, hypopigmented, hypertrophic).