What Causes A Green Fluid And Blood Filled Boil On My Labia?

I have this thing on my right vaginal lip its kinda like a boil or ingrown hair. I have had it for years its came back recently and hast not gone away ill leaks out green liquid and blood and its sarting to move up its hard and hurts the skin is starting to die around it. I was woundering if it could he cancer cause this is how my grandmothers started