I am a 33 year old male and had intercourse with a female a few weeks ago. 2-3 days after, I noticed 4 round and white bumps on my penis shaft. At first I thought they might be genital herpes but they never blistered, I even tried to open them but they were solid and hard the entire time. THey were only approximately 1 mm in diameter, and one looked more like a skin tag. They didnt cause any itching or burning or discomfort, they simply were white and raised with one looking slightly different. They disappeared after a week. You any idea what they might be