For your dry skin and allergy, I recommend a two-step approach. First, apply a thick, fragrance-free moisturizer multiple times daily, especially right after bathing, to lock in moisture. Second, for the allergic reaction and itching, you can use a mild over-the-counter 1% hydrocortisone cream on the affected areas twice daily for up to a week. Taking an oral antihistamine like Cetirizine can also help relieve itching. Avoid hot water, harsh soaps, and scented products. If your symptoms do not improve, please consult a dermatologist.