Without examination, confirmation of a diagnosis is tough but it can be contact dermatitis,rash due to friction rub,folliculitis,cysts or
genital warts(caused by HPV or
Apply warm compresses, Neospor
in ointment and calamine lotion and avoid messing with it.You can take anti-inflammator
y pain killers like ibuprofen or
acetaminophen. If the lump persists then it will be best to get it evaluated from a dermatologist.