Small lump just below the clitoris that swells up at times and then shrinks. when swelled up sometimes has a slight purple color. doesn't hurt at all.

Poss Vien: Without examination is difficult to say, but it sounds like a vein much like a varicose veins that can occur in other areas. A bit unusual for you to have it there, but still possible. Get it checked to be on the safe side. Always helpful to have a medical professional check unusual things like this. Glad to hear that it is not painful.