Hello,
Itchy rash on arms and legs can be due to many causes like dermatitis, lice, scabies and hives, eczema, lichen simplex chronicus, stasis dermatitis of legs or viral infections.
You can apply an anti-itch
cream or lotion to the affected area. Oral antihistamine, such as Benadryl can also be used. You should take a comfortably cool bath and wear smooth-textured cotton clothing. Covering the affected area with bandages and dressings can help protect the skin and prevent scratching.