Normal to have some glans discoloration?

So I did PE for 5 months about 5 years ago, and I did get a very small brownish spot on the glans. Recently I got back into PE with a newbie routine, and I think I may have irritated the glans. Its mostly tan/skin color but there seems to be some areas that are just a little bit darker than normal. Like a purple or brownish color. Is this normal?