I Have A Stomach Scar That Is The Result Of

I have a stomach scar that is the result of a complete hysterectomy and the upper belly skin hangs over the lower belly where the scar is . In the summer when the air temperature is very hot, the skin rubbing skin creates a very red painful area all across the entire scar area. This gets so bad that it create a very foul smell. Is there anything that can be done about, and what kind of Dr. Do I need. What is the medical term for this?