Hello, my friend had some small white bumps on his penis and it was red on the glans. After a week it went away, could it have been a yeast infection?

Based on the symptoms described, such as white bumps on the penis, redness on the glans, and no itching or pain, it is possible that it was a fungal infection. If the symptoms have cleared up and there are no other concerns, it may be safe to resume unprotected sexual activity. However, if any symptoms reappear or if there is significant pain or discharge, it would be wise to seek medical advice and potentially get tested for any sexually transmitted infections.