Thank you for your query
Your description closely resembles scabies
. It is a parasitic infection
of the skin. The web spaces in the hands and legs are especially involved. There's a lot of itching, especially in the night. If that is so, please don't let him come in contact with other children in the house as it is very contagious. In fact scabiocidal creams are prescribed for the entire family. It is a simple one time application which usually suffices. I suggest you show to your pediatrician
Take care and God bless you!!