Nail psoriasis. This is a type of psoriasis that only involves the nail beds. The nails look thickened and white and often separate from the underlying nail bed. The pitting of the nails is another common sign of nail psoriasis. The nail can also crumble in areas.
Seborrheic psoriasis. This form of psoriasis affects primarily the scalp because of its many oil glands. It can look like a severe case of dandruff with patches of thickened and flaky skin extending down onto the forehead or down the back of the neck. Scales can begin to build up in the external ear. The face, however, is usually spared from this type of psoriasis. In some cases, it can look a lot like seborrheic dermatitis, a form of dandruff eczema that is caused by something else altogether.
Palmoplantar psoriasis. This is psoriasis that affects only the palms of the hands and the soles of the feet. One may see flaky patches of skin that can crack and bleed. The nail beds can also be affected in this form of psoriasis. Remember that pustular psoriasis can also affect the palms of the hand and the soles of the feet. The pustules are usually copper-colored and lie on a bed of red, flaky skin.