Please help!! Any idea what this is???

i had unprotected sex about 10 days ago. The past couple of days ive noticed File size is too biga rash has shown up on the head of my penis. i took a std tests 2 days after i had sex and everything came back negativity. Any ideas what this rash could be??

cannot see your photo can u crop it down to make it smaller

it keeps saying the file size is too big

u need to cop it or shrink the size

what stds did you test for? 2 days after sex might be too soon? Possibly?

2 days after sex would be to early for some stds without a photo i cant really say wat it could be as things like yeast can cause rashes