You need to check with your surgeon about the lunges and squats. The prosthetic hip can become dislocated. A physical therapist could also give you some guidance in this area. This would require another surgery to get the hip back into place.

You can use vitamin E for the scar. Vitamin E will fade the scar dramatically. Massaging the scar and the surrounding area can help with the fat deposit. Use a massager on the area. This does help but it takes time so don't give up if you don't see results right away.