I have a burning sensation in my bum 3 wks PO. Is this normal? Could it be a result of walking or sitting the way I do? (photo)

Hi. Is it normal to experience burning sensation in your bum 2,5 week post op? I'm not sure what could cause this, but I returned to my job today where I have been walking roughly for 7 hours and standing up a lot. Will this damage the result? I also been relaxing in a inflatable swim ring, the bum not touching the ground. But my sides/hips gets a little squeezed so this could also have caused the burning pain I feel in my bum now. However, is both of these activities hurtful to my result?