Hello,
It can be due to many causes like folliculitis(might only be felt as small lumps in the skin commonly with a
hair arising from centre) , pearly penile papules(multiple, small (about 1-3mm) papules running around the
circumference of the crown of the glans penis) , Fordyce spots (small (1-5mm) bright red or purple papules
that can appear on the penis and usually effect younger men),molluscum contagiosum,cysts or genital warts due
to HPV infection.
An evaluation by a dermatologist is required to confirm the cause.Hope it helps.Take care and regards.
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