Flap surgery on the ankle bone 13 days and still a little pain belongs to the normal phenomenon, considered with the operation area is not completely healed, but also does not exclude the possibility of infection and so on. Flap surgery involves transplanting a block of skin and subcutaneous tissue from one part of the body to another, so that the transplanted flap establishes new blood circulation in the surgical site. It usually takes about 3 weeks for the new blood circulation to be established after the surgery, and about 1 month to return to normal. A little pain in the operated area 13 days after the surgery is a normal phenomenon, and if the pain is accompanied by redness and swelling of the skin, high temperature of the skin, and exudate, etc., infection is suspected to be possible. If the pain is accompanied by redness, swelling and high skin temperature, exudate, etc., infection is suspected. If there is still a little pain after 13 days of flap surgery on the ankle bone, it is recommended to follow up in time and differentiate whether it is a normal phenomenon under the guidance of the doctor, so as to avoid delaying the condition.