Dear Sir/ Ma'am,
Sorry to hear about your problem. The cyst
you are describing is quite common after skin grafting
. It is the collection of fluid beneath the graft and it usually subsides with time. If it does not settle down by itself within a day or two, you can visit your doctor and they would just evacuate the cyst by putting pressure on it or by puncturing it. Do not try to evacuate the fluid yourself, as it can lead to the infection of the graft.
Hoping for the best.