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I'm sorry that you're having to deal with it. The sequence of events does sound suspicious for herpes. The typical description is onset within 3-7 days of the sex, starting with a mild itching sensation, then a blister that breaks open to form a shallow sore. The only thing that doesn't match is that the sore usually hurts at least a little when you touch it. It might not hurt without touching it. Sometimes there can be a mild feeling of a flu and swollen lymph nodes in the groin. Can you attach a photo using the paperclip icon on your screen? The best way to make a diagnosis at this stage is to have a viral culture swab taken off the lesion. If that's positive, the diagnosis is 100% certain. But it depends on timing. If the sore is in the wrong stage of development or already healing, the viral swab could be false negative.
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