With the cold weather lately, my skin is very sensitive. welt looking bumps on my back and elbows & skin turns red easily when itched. normal?

Cold urticaria : it appears you are having a reaction to the cold called cold urticaria or hives. You should see your doctor or an allergist for evaluation and treatment.

Cold urticaria-hives: Urticaria is an allergy-like condition that occurs when your body reacts as if to stop a foreign infection. When exposed to cold you break out. Other get it from sunlight, citrus, or a viral infection. It's a histamine problem, so OTCs like cetirazine or Benadryl (diphenhydramine) can block the effect. The spontaneous marks are hives, the marks from scratching is called dermatographism.