Your symptoms don't sound like herpes, which does not cause prolonged tingling or itchiness, dry/flaky skin, or "spots" that remain more or less unchanged for weeks at a time. You are wrong about herpes being the "VD you can't really test easily for". Accurate blood tests are available to determine whether a person is infected with herpes simplex virus type 1 (HSV-1), HSV-2, both, or neither. You could be tested, whether at a walk-in clinic or elsewhere.
But regardless of the result, I am certain herpes is not the explanation for your symptoms; and since 25% of the population has HSV-2, you might find you are infected but still not know what's going on. See a health care provider if your symptoms persist; at a minimum, s/he will be able to tell you whether the "spots" are abnormal or not. In the meantime, it is unlikely you have an STD or anything you can transmit to a sex partner.
Good luck-- HHH, MD
After I posted my response, I realize I missed your comment about the scab. That symptom (and only that one) does raise my suspicion about herpes a little bit. Only a little, but perhaps worth checking out. You might want to go ahead and have the herpes blood test.
HHH, MD