Our expert says:
Like so many things in medicine, there are surprisingly many things that can cause lumps or bumps on the penis,, from the entirely innocent through different conditions - only a proper physical examination and history from a doctor, in person, can help to clarify what the likely cause is. If an STD is suspected - or, even if it isnt, but as in this situation it's important to be able to rule it out, some simple tests including blood tests could make this clear.
I don't see any way in which having sex while you were menstruating could cause any such thing.
A good GP could probably be useful as the first stop. If he remained puzzled, he could refer your fiancee to either a dermatologist or an STD clinic.
Hope this helps.
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