I am having kind of bikini line boils after applying an aftershave cream which said that itll prevent itching and irritation after shaving down there. any treatment or otc for it?

Bikini area shaving is notorious for leaving bumps, redness and sometimes even infected ingrown hairs. This goes down over time. Try using warm compresses to bring the pus from the boils/infected follicles to the surface, apply a topical antibiotic ointment, and avoid using anything irritating in the area until it heals.

Shaving your genital area is unhygienic and you should quit doing it. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines