V.R.
Could be warts caused by a virus. My son had them and it takes many weeks for them to go away, maybe months.
To determine if they are warts, get a magnifying glass and look at one close up. If it looks like a donut with a concave area in the middle of it, they are warts. The hole does not go completely through. Looks like a Red Blood Cell if you know what that looks like.