Without examination,confirmation of a diagnosis is tough but it can be folliculitis,cyst , some benign skin growth or genital warts(caused by HPV infection).
Apply warm compresses, Neosporin ointment and calamine lotion and avoid messing with it. You can take anti-inflammatory pain killers like ibuprofen or acetaminophen. If the lumps persists then it will be best to get it evaluated from a urologist.
If it is under the skin and painless then the possibility of a cyst or benign skin growth are important to be ruled out. A cyst is a closed sac below the surface of the skin that may with a fatty white, semi-solid material called sebum produced by sebaceous glands of the epidermis. It is usually painless but can become painful if infected. Then antibiotics are needed.
I suggest you to consult a dermatologist and get any benign skin growth ruled out.
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