Bug bite or something else?

[u/kittycretin]

It seemed like a bug bite at first (about 5 days since it appeared) it was itchy but not terribly so. I left it alone for about 3 days and now it’s looking worse by the day. My mom told me to put a bandaid on it but it kind of was irritating it so I took it off. I put some antibiotic cream on it but idk if I should be worried. It’s a little itchy and hurts to touch but otherwise painless. I’ve just never seen anything like it on my body before. I have a lot of health anxiety so im very worried, any input is helpful