Thanks for the query,
He might be suffering from scabies
It is quiet common infection an child hood.
It will be better to give an application of permethrin.
Also give an anti histamine
This will control the itch.
Please meet a dermatologist
for exact diagnosis.
And get the medication prescribed.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you good health,