My wife operated by laparoscopy surgery
In that period, nurses put injection on her hip
Two small knots are there, we an feel it by touch
And pains by touch
Does thease knots will recover automatically or we need to do something treatment?
Doctor says it will recover itself, somebody says apply ice, somebody say hot water bottle to roll.

Advise

Yes, the knots are painful and not uncommon. The knots will recover soon enough, it is just putting up with them at the time. Apply ice as suggested.

Totally common. Just apply some ice packs or alternate hot/cold as she can tolerate it.