All skins dehydrate with low humidity, whether it is very hot or very cold; some skins are inherently dry and even the greasiest of teenage skins dry out after the age of 45.
The best solution is to apply a moisturiser one or more times each day, immediately after bathing, when the skin is still slightly damp. Dry skin that is not lubricated regularly may become itchy and break out in a rash.
The best remedy is also the easiest to find: water. Drink 6 to 8 glasses a day and eat foods high in water content, such as fruits and leafy vegetables. Use a humidifier in winter.
Bathe in mildly salted water (4 tablespoons of salt per tubful) to rehydrate your body, then apply a moisturizing cream or lotion. Oatmeal added to bath water (without the salt) eases itchiness.
For a moisturising facial, mash a banana, add a tablespoon of honey and smooth the mixture over your face. After 15 minutes rinse with warm water. Alternatively, mix up a beaten egg yolk with the honey and spread the yolk mix onto your face.