Had a full std panel, tested negative for everything except for hsv1..i have painless bumps/ulcers which dont hurt/itch..what could this be?

Doctor to evaluate: Rashes are difficult to describe in words. They may be part of an allergic reaction or an infection. Location matters; some rashes are "generalized" (all over the body). Bluish or purplish spot are blood spots and may need blood testing right away. Sometimes, bumps have unknown causes. A primary care doctor or dermatologist can examine both the rash and the patient, to find a treatment.