Ceramides. Several lotions/creams have ceramides which help heal tiny cracks in the skin. Cetaphil with restoraderm has it. Also curel intensive repair. Also cerave and others. The tiny cracks allow proteins through the skin which results in an allergic reaction.
Protect. Avoid things that make you break out, soaps & wetness. Wash your hands only when necessary. Wear gloves when needed. Wear clothes made of cotton. Bathe only with a small amount of mild unscented soap, such as dove. Keep the water temperature cool or warm, not hot. Use the medicine your doctor gave you. Use a plain moisturizer daily. Avoid scratching or rubbing the itchy area. Manage stress.