There hundreds of bumps on underside of penis and on scrotum (when stretched they are more visible.) most come from hair follicles. painless/non-itchy?

Yes, there are: Yes, there can be hundreds of bumps on the underside of a penis and on a scrotum. They should be painless and non-itchy, and are hair follicles or are related to follicles. If there are one or a few bumps that look weird or big, compared to the other bumps, one's primary care doctor can examine with a light and magnifier to see if the few weird bumps are warts, molluscum, skin tags, etc...