The left breast

Hello
I am 31 ​​years was carried out before 10 years in the left breast to reduce the size and after surgery I felt pain simple and the threads on the breast and clear and not cosmetic, unfortunately, and for even now I feel Pain simple and breast size metal before surgery and I feel the pain when you press it, or when it comes football. Is this bag is the so-called CYST ??? and what is the solution you need for the process to remove it ??? is it a danger to my health in the truth but I'm concerned about that and I can not swim because of its shape

Notes: Two weeks ago increased the pain a little, and no other symptoms except pain on my health from a simple process for 10 years so far

please any expert can update me soon

thanks and regards