Black/Brown flat elongated dots apearing on the glans of my Penis

[Fz39]

Hi I am circumcised. Few months ago I noticed 2 brown/black spots similar to little moles on the head area of my penis. First I thought it could be mark of any kind and would go away after few days. But surprisingly there is no sign of going away rather I have noticed a few more brown/black spots appeared around the head of the penis. Although they don’t hurt or itch looks harmless to me. But still I am worried why suddenly they are coming on this area? Are they turning into anything sinister in future? Please help if anyone has similar concerns. I am really nervous about them.