Trim your child's fingernails or cover the hands with socks or mittens to prevent scratching, which could lead to infection as well as to possible scarring.
Home remedies for itching can be effective - try adding 3 grams each of rosemary and calendula teas to a litre of water; bring to the boil, then simmer for five minutes. Strain, discard the herbs, and allow the wash to cool. Press a washcloth dampened in the solution to the child's skin after a bath - this wash can be used for three days if kept air-tight in the refrigerator.
Using a "sponge" containing oats in the bath is another method which can also be used to reduce the itch. Put a handful of rolled oats (the kind you use to make porridge) in the foot of a stocking and hold it over the tap to run the bath water through it. When the bath is full, tie a knot in the stocking and use it to sponge the itchy skin.
Chicken pox is extremely contagious. Keep your child home until most of the vesicles are dry and the scabs have fallen off. Avoid contact with children and adults infected with chicken pox in order to avoid catching it yourself.