Help please!

Okay so something bit me a couple of days ago.... at first it didn’t look like anything. But now...

Honestly I’m very allergic and I’m scared shitless because it look even worse than it did yesterday... fml it’s hot, red af, huuuge and itchy🤦🏼‍♀️

Any recommendations as to what to do to get it to look better?

Thanksss!🙏🏻