Place cool wet rags over the rash to relieve the itching. Put calamine lotion on the rash. Take a bath in oatmeal, you can put it in a stocking and hold it under the water running in the tub so your drain will not get clogged up. Make sure the childs nails are not long so when they scratch it will not scrape the rash, so cut them if need be. Use acetaminophen to reduce fever, aches and pains. Eat soft foods and avoid acidic juices if you have pox in your mouth. Try and stick to a nutritious diet so you can rebuild your immune system.