Welcome to HCm,
It seems that you are having ingrowing of hair follicle giving rise to recurrence of boiles.
It is possible that you might be having some scalp
infection like dandruff
, fungal infection
So consult your doctor and get your scalp examined.
For your present complain one course of antibiotic is enough.
Do not keep your hairs wet for more time.
use branded hair oil and shampoos.
ok and bye.