My 3 year old has pimples that are itchy and come in winter around his body but not the face. i would like to know possible causes of these pimples. ?

Possible atopic derm: It is possible that he has atopic dermatitis, and allergy testing may help to avoid possible contact allergens. Use a facial moisturizer without fragrance a few times per day, apply a low dose steroid cream sparingly to the areas involved on the face twice daily. Please use sun safety and a hat while outdoors. Continue to monitor for signs of infection such as pus,redness and swelling.

Dermatitis: This could be atopic dermatitis (eczema) or a contact dermatitis, or just very dry skin. Keep track of any clothing, lotions, soaps, shampoos, other substances that he might be in contact with during the winter, but not other times or that are new. Use unscented moisturizers daily and bathe less frequently as that may dry skin more. Call your doctor to be seen if not improving or if worsening.