Cists can be a result of Unclean injection sites or on-sterile gear.
They can range from small lumps to golfball size lumps (in some cases baseball size).
If infection sets in they will need to me removed to avoid further infection of the surrounding site.
Yes I still have 2 small Cysts in my Glutes from 5yrs ago when I injected Equipoise, the area is no longer sore but when I recently tanned up I noticed that one of the Cysts had moved closer to the surface (Due to
fat loss diet) and actually popped like a pimple, Disgustin I know but the area is now not so large and is ccompletely invisible in posing trunks.