Hello,
The symptoms on face can be due to seborrheic dermatitis but for the itchiness on the whole body can be due to dry skin as well because winters can often cause dry skin. Other than that, other conditions cause itchy skin as well. Skin conditions like psoriasis,dermatitis,lice,scabies and hives, internal diseases like liver and kidney disorders,diabetes, iron deficiency anemia, irritation and allergic reactions to chemicals,wool,soaps,cosmetics and certain foods can cause itchy skin.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
I've consulted to my gp which suspected this to be allergic but the symptom didn't subside as I took the prescribed medicines, would appreciate any kind of help before I go for a dermatologist.