Hello Ma'am , Welcome to Practo Ma'am  periodontal flap surgeries are mainly done due to cosmetic reconstruction purpose , some times flap surgeries are done to correct a perforated sinus and many other uses.  Its a Covit -19 situation Ma'am , I guess if its comsetic purpose kindly avoid for now. You can easily upload an image of the area to me to get opinion or medications that would buy you sometimes as avoiding current situation  and going out for a surgery is what am trying to do. Am here to help ,I would assist you through and through

Dear practo user Definitely flap surgery is beneficial if done with proper indications. Can share photos and X-ray for definite treatment plan of particular area.

Before answering your question I need to know where and what is the problem ,flap surgeries are of different types and cost varies according to the patient condition and also depends on clinic to clinic