MACULE – A circumscribed flat area of discoloration that is less than  1 cm in diameter (without elevation or depression).

PATCH – A circumscribed, flat area of discoloration that is greater than 1 cm in diameter.

PAPULE – A papule is a circumscribed, solid raised lesion that is less than 1 cm in diameter

PLAQUE – A plaque is a circumscribed, solid raised lesion that is more than 1 cm in diameter. Usually broader than thick

BLISTER–   fluid-filled raised lesion (based on size can be a vesicle or bulla)

VESICLE – small, superficial, raised fluid filled blister of less than 1 cm

BULLAE –large raised fluid filled blister of more than 1cm

PUSTULE – A purulent (pus filled) vesicle 

NODULE – A palpable, solid lesion that is greater than 1 cm in diameter. Nodules are usually found in the dermal or subcutaneous tissue, and the lesion may be above, level with, or below the skin surface.

ULCER – An ulcer is a break or discontinuity of the skin exhibiting complete loss of the epidermis and often portions of the dermis.  

EROSION – An erosion is a discontinuity of the skin exhibiting incomplete loss of the epidermis