Use warm, not hot, water for at least 10 to 15 minutes. Avoid scrubbing your skin with a washcloth.
During a severe flare, you may choose to limit the use of cleansers to avoid possible irritation.
(within three minutes of taking a bath or shower), apply any special skin medications prescribed for you and then liberally apply a moisturizer. This will seal in the water and make the skin less dry and itchy.