Table 2. Localized Pigmented Surface Lesions of Oral Mucosa

INTRAVASCULAR BLOOD LESIONS Usually blanch on pressure and compressible
Varix	Blue; thickened; sometimes does not blanch due to thrombosis.
Hemangioma	Congenital; thickened; red or blue
Kaposi sarcoma	Patient is immunocompromised; may be thickened or flat.
EXTRAVASCULAR BLOOD LESIONS Do not blanch; present for less than 1 month; may have history of injury or bleeding problem.
Hematoma	Thickened; firm to palpation.
Ecchymosis	Not thickened
Petechiae	Focal and pinpoint size; red; multiple; not thickened
MELANOCYTIC LESIONS Persistent; do not blanch
Ephelis (freckle)	Not thickened; located on sun-exposed surfaces.
Oral melanotic macule	Not thickened; located on mucosa not exposed to sun
Nevus	Thickened; may be flat early in development
Melanoma	Thickened; may be flat early in development
TATTOO Do not blanch; may be history of injury; radiopaque object sometimes seen on radiograph; may be thickened or flat.