For four months, I have a distracting intermittent (days on and off) itch in my genitals which waxes and wanes but never fully resolves.  I have been tested repeatedly for HIV, HSV 1 & 2 (IGG and IGM), Gonorrhea, Syphlis, Trichomoniasis, and seen by a board certified dermatologist.  All negative. Never a visible sore or rash or wart. I understand concern or anxiety can produce these symptoms but these are unlike past only in that they never resolve and provide unwelcome distraction. Sometimes feel like miniature razors slicing skin.  If I did have an infectious STI, what possibilities remain and what would you test for.  I fully understand the likelihood is it is just anxiety but would like to understand the potential STIs that might remain possibilities to be safe and sensitive to my partner.
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Welcome to the forum. Thanks for your qeustion.---

As I suspected- Many thanks- sometimes an impartial answer from a knowledgeable Doctor can be very reassuring- thanks

Thanks for the thanks. I'm glad to ahve helped.---

If a woman I have just had sex with starts complaining of the same sort of genital itching within a few days of intercourse, how would you interpret that, and are there any lesser knows STI's or tests that you would pivot too?  Of course I am jumping the gun out of anxiety, but if that happened, what would you coulee?  Many thanks

I meant- "what would you counsel?"

I remain confident you have no STD and haven't infected your partner with anything that would cause genital itching. This is an exceedingly common symptom in all humans, usually with no discernable cause. The most common infectious cause of genital itch in women is yeast infection, which nearly all women have from time to time. Yeast isn't sexually transmitted (we all have yeasts on our skin, especially moist surfaces like genitals, etc), but sex often triggers yeast symptoms in infected women. Also, if your partner also has an inclination to anxiety about genital symptoms, and if you told her of your itching, that alone might explain hers. I'm speculating of course, but that seems more likely than any STD.---