Your son may have dry skin
that could be eczema but the boils is secondary to infections with a common skin bug called staph aureus. If there are any boils actively bursting, a pus c/s or swab will identify the mechanism.
Antibacterial creams such as Fucidin are helpful against such bacteria and Mupirocin
cream 2% nasal oitment to eradicate carriage and chlorhexidine
soap to wash the whole body is recommended. Please get in touch with your doctor to see if this is feasible.
Children's skin are sensitive to insect bites
, and the same cream will help (Fucidin).