Welcome to HCM
First of all I would like to inform you that scalp
hygiene is the most important thing for scalp infection.Boil is infection caused by the bacteria can occur various part of the body surfaces.In infancy extra care should be taken for scalp hygiene.In healthy scalp no oil should be applied over scalp rather baby shampoo should be used.In unhealthy scalp medicated shampoo(with ketakonazole) may be used with doctor's advice.This is a prevention for further bacterial infection.
So please consult your pediatrician
for best solution.