What's this dark spot on penis glans?

Hi Doctors, i have this dark spot on penis glans which I noticed around 2 month back. I might have also noticed it around 5 months back but somehow I completely forgot about it but I am not 100% sure whether i have seen this 5 months back or not. So I am considering that I have noticed if for the first time 2 months back and this is surely not something that I had from birth. I will attach pics for your reference. This spot doesn't hurt, itch or feel soar it's just there and this is bothering me a lot. I continuously think about it and try to notice it actively to spot for any changes. And because it stretches out or change in shade depending on how flaccid,  errect, dry or wet the penis is. This has given me severe health anxiety as I am continuously thinking about chances of it being a melanoma. I have family history of alot of moles but no family history of melanoma or cancer. I sometime feel like it is changing at a very slow rate which can also just be my health anxiety kicking in