This thing on my shoulder? WHAT IS IT? I thought it was a mosquito bite but it got bigger and it itches SO BAD.

I swear there are puncture marks in the middle, and I checked for fangs, too. The photo is pretty shitty but this thing is purple.

It is probably some kind of spider bite, right? Or could it be a malignant melanoma? I have been getting a lot of sun lately. I don't know. It feels all tight like it's full of poison. I'm kind of scared that I'll wake up tomorrow and my whole epidermis will be this swollen, itchy purple thing.

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Assuming it's bug related, or arachnid related, is it normal for bites to get bigger? And what should I put on it? I have some antihistamine stuff but that didn't seem to help. ....Should I just stop scratching it? I would, but I know it's there, so I can't really do that.