Hello,
For these moles, angiokeratomas need to be ruled out. These are blue-to-red papules with a scaly surface located on the shaft of penis. The other possibilities are of of genital warts, skin tags or any mole being turning into a melanoma. Last but not the least it can be due to mollsuscum contagiosum which presents as multiple, small, dome-shaped papules, often with a central depression or plug. My sincere advice is to consult a dermatologist and get a skin biopsy done because treatment is diagnosis specific and it is through examination and skin biopsy only that we can make a precise diagnosis.
I hope it helps. Take care and regards.
It is important that he gets this checked by a doctor, only then can a diagnosis or referral be made.
It can be anything from genital warts or other more serious problems.
Do not wait the sooner treatment is provided the better the outcome.
All the best,
Rmpr