hi dear, it is indeed a condition of ingrown hair. this happened because u shaved in that area. here is my advice...
take some antibiotic like ciplox
500 mg twice daily for 7 days, this is must
try to remove the hair from that bump. it ll hurt but is necessary.
apply oint mupirocine in that area twice daily for 7 days.
u must not shave in that area again, u can remove hair using a cream.