Large leg lipoma removed & still sore with swelling almost 4 months later. Will it go? Or get better?

I had a lipoma removed from the outside of my thigh at the top in October 2016, it was the size of a small melon & still have swelling. I had a drain left in for two days after surgery & had it drained several times. In the beginning every week, then biweekly & then last time was in January 2017. I am still not able to sleep on this sise as it hurts (max 10mins) and this was my predominant sleepside. The lump is now still there and swollen will it ever go? Should I have it drained again?