Thanks for your query.
You didn't mention the size of the Cyst
which was removed.
The pain after surgery may be due to infection at the surgery site.Because of the associated inflammation,there may be swelling and it would be tender to touch.
If the cyst was large,there will be some serous collection beneath the suture in the dead space.It resolves spontaneously sometimes.Or else it has to be drained.
Please consult your surgeon and get it treated.
But,nothing to worry.
Wish you good health