Psoriasis is a topical condition and can show itself anywhere on the body, although it is most common on the outside of the elbows, knees and on the scalp.
A person with this condition may experience a burning or itching sensation in the affected areas as well as dry cracked skin that may bleed. Psoriasis generally covers the body in patches that may look red and flaky, and can even affect the toenails or fingernails causing them to be ridged or pitted.
Unlike Psoriasis, skin affected by Vitiligo is unlikely to change texture, although some itching is possible. The affected skin cells will lose their pigment, causing them to turn white.
Although the depigmentation is more obvious in exposed areas, the most commonly affected areas of the skin are the face, hands and underarms.
Vitiligo occurs in three general patterns: 1) Focal: limited to one area, 2) Segmental: on one side of the body, or 3) Generalized: on different areas throughout the body.