Add bath oil, oatmeal bath preparations, Epsom salts or Dead Sea salts to lukewarm water. Soak for at least 15 minutes. This eases itching and inflammation.
Especially right after bathing, applying a heavy, ointment-based moisturizer will lock moisture into your skin. This prevents dryness and cracking. During winter months, using a humidifier also can help.
Psoriasis often is terribly itchy, but scratching can make lesions appear or aggravate the inflammation. Instead, try applying a cold compress, a menthol-based ointment or a topical cortisone cream.
Sunlight can improve lesions, but too much can aggravate psoriasis. Check with your healthcare provider first if you're undergoing UV or retinoid therapy. Then keep sun sessions short, and apply a sunscreen to unaffected areas before you go out.
Cotton is less likely than any other fabric to irritate your skin.