Do you have the results of your IgG - like a piece of paper with them or on a patient portal or anything?
Since you only have one number for the result, I wonder if it's a combo test, where they test for hsv1 and hsv2 together, and don't differentiate them, meaning you could have hsv1 OR hsv2 OR both. It's harder to know if it's likely to be a false positive if we don't know which type tested positive for.
Can you get your results? If it says something like "Herpes 1/2 IgG 2.20", that's the combo. Ask your doctor for a type specific IgG test. If you only test positive for hsv1, it's more likely to be a pre-existing oral infection, statistically. (At least half the adult population has it, and about 90% will never get a cold sore, so they don't know they have it.)
You can have both dermatitis and herpes, but since the dermatitis came back with actual skin testing, and herpes didn't, I do have to wonder.
When you say you were tested a few times, but it was always negative, were those cultures or blood tests? If they were blood tests, when were those done? Do you have copies of those tests?
Ringworm? Ringworm is a fungus (think jock itch), so if that's even part of what is causing this, the cream will help.
If they don't differentiate between the types, it's kind of pointless. Your cultures are coming back negative for herpes, which means that herpes isn't causing your symptoms. It doesn't mean you don't have genital herpes, but if you do, this isn't the cause for your symptoms.
A combo test isn't going to tell you anything you don't already know. You may have type 1, type 2, or both. My guess right now would be a type 1 oral infection, as statistically, that's most likely, and your cultures are coming back negative for type 2. That's a guess, though.
If you could find a doctor who could figure out a way to do a type specific test, I'd say go for it. If it's just another combo test, I don't know that it's worth your time (or money, if you have to pay for it).
When you come back to the states in a year, you can get a type specific IgG test, if you can't find one there before that time. You don't even need a doctor to do it - https://www.stdcheck.com/ Lots of our members have used them and they seem really reliable.
If you decide to get another test done, let me know how it goes.