Welcome to HCM.
I am suspecting a furuncle
or small abscess
caused due to bacterial infection. The perineum
, that is the area around the genitalia is more prone for bacterial and fungal infections as they are moist regions allowing the microorganisms to grow easily. Personal hygiene in those areas is very important. I suggest cleaning the area with soap and water. Application of antibacterial cream over the bump. Get in touch with your GP for a prescription of antibiotics and painkillers. Thanks.