types of lesions

• pustule

  pus-filled
• wheal

  smooth, slightly elevated, edema
• cyst

  fluid or semisolid thick-walled filled sac
• vesicle

  clear bluid, blister
• crust (scab)

  dried serum and cellular debris
• polyp

  benign growth from mucous membrane surface
• macule

  discolored, flat
• erosion

  wearing away or loss of epidermis
• nodule

  solid, elevated mass, more than 1 cm
• fissure

  slit or groove
• ulcer

  open sore on skin or mucous membrane
• papule

  small, solid elevation, pimple or plaque