Hello mushroom. Winter does not necessarily mean no heat rash as too much occlusive clothing may present a similar picture. In your case, need to enquire if it is hot water or cold water that aggravates the issue. Hot Tub Folliculitis while soaking in bathtubs may be a factor to consider. Your problem would definitely need a dermatologist to look at it. YOu may want to visit your nearby dermatologist or alternatively photograph your lesions, upload onto this site & consult me through a regular paid consult which may still work out economical for you..but prefer you to be looked at. Off the cuff, a steroid lotion (if it can be prescribed OTC in your country) may be the order of the day together with an antihistamine & moisturizers/cleansers. Regds & get well soon..Dr Praveen Rodrigues, Bangalore, India