You might be having simple furuncles
or abscesses or may be a skin condition known as hidradenitis
suppuritiva where one gets multiple boils and abscesses which heal with scarring or sinus formation. The sites involved are groins, axilla, mammary area, buttocks etc. it usually begins in puberty
Both these conditions are treatable. You need to fix an appointment with the dermatologist
, so that a proper diagnosis based treatment could be started.