Macule: Small spot (Less than 5 mm), different in color from surrounding skin, that is neither elevated nor depressed below the skin surface.
Patch: Large spot (>5mm) different in color from surrounding skin.
Papule: Small (less than 5mm diameter) circumscribed solid elevation on the skin.
Plaque: Large (>5mm) superficial flat lesion, often formed by a confluence of papules
Nodule: Large cirumscribed solid skin elevation .
Pustule: Small circumscribed skin elevation containing purulent material.
Vesicle: Small (<5mm) circumscribed skin blister containing serum.
Bulla: Large(>5mm) vesicle containing free fluid.
Wheal: Irregular elevated edematous skin area, which often changes in size and shape.
Cyst: Enclosed cavity with a membraneous lining which contains liquid or semisolid matter .
Tumor: Large nodule, which may be neoplastic .
Telangiectasia: Dilated superifical blood vessel.
Burrow: A linear or curvilinear papule, caused by a burrowing scabies mite.
Comedone: A plug of keratin and sebum wedged in a dilated pilosebaceous orifice.