I have a painful boil on my ear near tragus and near my vaginal opening, had one last month too on my labia, what can this be-only pain no itch.

Infection: Sounds like you have some type of bacterial skin infection causing boils/abcesses to occur. You need to seek medical attention and get the areas treated. Best wishes.

Infected oil gland: Have you changed soaps, detergents, body lotions...? Boils are infected lubricating glands, something in your environment may have changed increasing your chances of irritation to the glands