COS Hypertrophies & Pigmentation

Thickening of the epidermis due to pressure and friction - a corn

• callus

• verruca

• skin tag

• keloid

Warts caused by a virus - could be contagious

• verruca

• skin tag

• callus

• keloid

Small, elevated growth of skin

• skin tag

• verruca

• callus

• mole

Too much pigment (hyperpigmentation) due to overactive melanocytes

• melanoderma

• leukoderma

• cholasma

• nevus

Too little pigment (hypopigmentation) due to decreased melanocyte activity

• leukoderma

• melanoderma

• cholasma

• nevus

Group of macules in one place, like a liver spot

• cholasma

• mole

• nevus

• leukoderma

Small, brown pigmented spot that may be raised

• mole

• nevus

• cholasma

• vitiligo

Reddish purple flat mark, like a birthmark

• nevus

• mole

• cholasma

• leukoderma

Failure of the skin to produce melanin

• albinism

• vitiligo

• melanoderma

• cholasma

Oval or irregular patches of white skin

• vitiligo

• albinism

• nevus

• verruca