I found a single red dot on my labia- very small, could this be an std?

Small red dot: This would be inconclusive at this time. Continue to watch the area and if it persists or spreads be examined for a diagnosis.

See MD: Difficult to answer question. You need to be examined and your history needs to be reviewed. Good luck

Hemangioma?: No STD causes a "red dot", especially if painless, doesn't become a blister or sore within 1-2 days, or otherwise change. Painless "red dot" suggests hemangioma, i.e. a blood vessel "mole", which is harmless, not abnormal. They are more common as people age; or perhaps you had it all along and didn't notice. If no change in appearance, just show it to your doctor next time you're in the office.

Probably not: "STIs are not always the cause of genital sores. Certain chronic skin conditions may also produce sores and symptoms such as itching, burning, and pain, such as: vulvovaginitis (vulva and vaginal inflammation) contact dermatitis (sensitivity to chemicals or irritants) atopic dermatitis, often caused by allergies" If you have any suspicion, it is always a good idea to have a doctor take a look;)