Spider bite, looks like herpes??? Help!?

Hi, I have a question here. My uncle was sure he was bitten by a spider on his neck, he even said he slapped it off when it was biting him. He had muscle pain, vomiting, fever, and started getting a skin rash in that area. The first two days he couldn't even move his sore neck. So anyway, he... show more Hi, I have a question here.

My uncle was sure he was bitten by a spider on his neck, he even said he slapped it off when it was biting him. He had muscle pain, vomiting, fever, and started getting a skin rash in that area. The first two days he couldn't even move his sore neck.

So anyway, he wouldn't listen to us, and didn't want to go to the doctor, until about four-five days later.

However, when the doctor saw him, he said it was herpes, or rather looked like herpes.

My uncle isn't very accepting of this, he says, there is no reason for him to have herpes. (My uncle is married, and pretty old fashion).

So my question is, how likely is it, that this can be a mistake? No tests were run, just diagnosed by the appearance of his rash.
Update: Ps. I mentioned my uncle being old fashion, because he is 66 years old, and says he hasn't been cheating. No previous history of herpes before.
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