If you have eczema or psoriasis
Conditions like ezcema and psoriasis are prone to winter flare-ups, when it's hard to keep skin moist. Keep showers short and luke-warm, and pat yourself dry (rather than rubbing) with a towel and apply moisturizer immediately, says Dr. Goldenberg.
You may be able to treat flare-ups with an over-the-counter hydrocortisone cream, or you may need to see your dermatologist for a stronger formula. Experts recommend keeping stress levels low and getting a flu shot, since these conditions may be linked to immune function.
(In fact, a 2001 study found the skin's ability to retain water is reduced during stress.) The lack of sunlight in the winter can make psoriasis worse. In severe cases, phototherapy with UV light, two to three times a week, may help.