Hi Lavinia
As Maria has already mentioned the best approach would be to see a Nutritional Therapist that could provide a personalised advice. As a general recommendation, increasing your intake of vitamin A, E, Zinc and Selenium could help to nourish the skin and support its repair. You could obtain these nutrients from orange coloured vegetables and fruits (oranges, apricots, carrots, sweet potato, tomatoes etc.), dark green vegetables (kale, spinach, broccoli), seeds and nuts, eggs and high quality meat like organic chicken and oily fish (mackerel, sardines, trout).
It is also important to check if you are reacting to household cleaning products, washing powders, shampoos and other personal care products and cosmetics. Break outs of dry skin, especially when accompanied with itching, could suggest environmental allergy/intolerance.
Dry skin in winter is quite common so try to hydrate more often (especially due to heating and wind) – you can use natural pure aloe vera to soothe the skin and choose oils that are naturally high in antioxidants like cold-pressed pomegranate and rosehip oil. It is good to avoid synthetic preparations with many additives and preservatives – creams usually need many due to the high-water content. Natural oils preserve themselves well due to high antioxidant content so you can find these oils in the shop without the additives that you may react to if your skin is sensitive. Always do a patch test to make sure the product is not too concentrated for your skin.
I would also recommend seeing your GP to check if your thyroid is working properly – low thyroid hormone can also cause dry skin or eczema.
Good luck!