found info on the net for you, seems like you need to get it surgically removed (only solution)
They are more common in hairier areas, where in cases of long duration they could result in hair loss on the skin surface immediately above the cyst. The
main symptom is usually a small, non-painful lump beneath the skin. Small lumps or bumps that occur just under the skin of the genitalia, breast, abdomen, face, neck, or elsewhere on the body are the most common symptom of sebaceous cysts.