I found a lump right under my vagina before my butt, its painful and skin colored. what could this be?

Infection: A painful bump around the genitals could be a sign of a sexually transmitted infection. You should consider visiting your doctor to determine what the cause might be.

Cyst?: The location you describe is common for cyst formation. However there are potentially serious infections which can occur in the area. Strongly consider seeing an ob/gyn or dermatologist for this.