Have you seen a doctor about these?
Do they come and go? For example - do you get them on your arm, then on your groin, then they disappear on your arm, then appear on your back, then disappear on your groin, appear on your neck?
That doesn't sound like any STD. It could be an allergic reaction to something you are eating/consuming, or using on your body.
One thing that is really important - I don't know how long you've been on the Eliquis, but in the side effects lists, it does say that if you get a rash, itching/swelling, to notify your doctor/get medical help right away.
I'd absolutely call your doctor promptly.