Many boils on the butt

You can use

GOLDEN SUNRISE

ALL CLEAR SERUM

BEAUTY SERUM

if their is pain PAIN CARE SERUM can be used.

BALANCE SERUM can be used in every healing.

you can also charge any cream or oil with the above said energies and apply on the affected area

please watch this vedio also about doing psychic surgergy and try to use it ...

https://www.litairian.com/psychic-surgery-reiki-how-to-easily-perform-using-vk/

@Saibisa

In addition to what is guided above, please check diet of your son. If he is eating heat producing or spicy foods that needs to be stopped. Diet plays a good role in healing frequent boils.

Also use keyword BOIL in search option and read success stories to get more ideas.