this could be a condition called hidradenitis suppurativa which could occur at any time. it is a scarring condition of recurrent boils in the groin under the bra line and even at the underarm region. it may be worse due to hormonal imbalance and weight gain. there are oral and topical treatments your dermatologist would be able to offer to help control the condition and minimize scarring.
when i started having kids i started getting boils around my panty line and my bra line any idea why?