PATCH : a large ( greater than 2 cms ) flat lesion with a color different from the surrounding skin. This differs from a macule only is size .
NODULE : a larger ( 0.5 -5.0 cms ) , firm lesion raised above the surface of surrounding skin . this differs from a papule only in size . ( example : a dermal nevomelanocytic nevus ).
PLAQUE : a large ( greater than 1 cm ) , flat topped , raised lesion , edges may either be distinct ( example : psoriasis ) or gradually blend with surrounding skin ( example : eczematous dermatitis ) .
PUSTULE : a vesicle filled with leucocytes . note : the presence of pustules does not necessarily signify the existence of an infection .
WHEAL : a raised , erythematous , edematous papule or plaque , usually representing short lived vasodilatation and vasopermeability .