Skin rash , allergies?

Hi everyone, as of 5 days ago I started scratching the back of my leg assuming it was just a mosquito bite. After a while, I realized it wasn’t a mosquito bite and the appearance of my rash has not reduced.

The rash pigment is circular and looks sort of like a raised scratch mark. There are 2 spots that look like this on the back of my leg, and when I bend my knee, they’re aligned

I used some scented bath salts stuff 3 bathing sessions ago, and I’m unsure if that’s related considering I’ve bathed since then.

If this is allergy related, what is the best recommended way to approach? Is this normal?