Does this look like any std symptom?

So I have been getting a rush on for maybe 2 or 3 years now. It's persistent and doesn't want to go away. I sometimes only get it at night and I scratch it and in the morning everything is fine. Other times I just have like lumps or pimples on my butt; they don't hurt all the time and they and they are dry and no fluid in them. ! I thought maybe herpes but I don't think I get too many outbreaks and they have no fluid. I know I need to see a dermatologist but I was just wondering if anyone has an idea what they could be! Thank you for your time.

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