So today I decided to go outside for a while. I felt like I had to go, so I decided to go to a Pine Tree (or the one with needles). The environment was a little humid, rained earlier, and was night. So right next to the tree, I went (because I was quite far from my house). I went back home a while later, and I felt irritating skin in my genitalia region.
I checked down and saw a red rash? The skin was red, but was not on my area, it was next to it (not directly on, it was to the left very close).

What is this?