I had an std of which resulted in painful urination, however that was healed, a couple of days after that i developed pimple like sores that went away, i noticed now that one just popped up, what could it be?

Genital sores: The eruptions may be from a herpes infection. There are usually some associated discomfort and blister like sores. If this is herpes, it can be treated. See your physician or a urologist while the sore or sores are present for diagnosis and treatment. Mention that you had a STD and treatment in case the MD you see doesn't know and get fully tested especially if you don't know your partner's statu