Could a small painless bump in my mouth be symptom of STD the mouth.The come to white head but about an hour later was gone.?

While it's possible that a small painless bump in your mouth could be a symptom of an sexually transmitted disease (STD), it's also important to note that there are many other potential causes for such bumps. Some other common causes of bumps in the mouth include:

Canker sores: These are small, round, and painful ulcers that can occur anywhere in the mouth. They usually go away on their own within a few weeks.

Cold sores: These are small, fluid-filled blisters that typically occur on the lips or around the mouth. They are caused by the herpes simplex virus and can be spread through contact with an infected person.

Mucoceles: These are small, fluid-filled sacs that can occur on the inside of the lips, cheeks, or gums. They are caused by a blockage of a salivary gland and are usually harmless.

If you are concerned about a bump in your mouth, it is always best to see a healthcare professional for proper diagnosis and treatment. They will be able to determine the cause of the bump and recommend the best course of action.