As far as I can tell there is some evidence that heat from an infrared lamp and maybe from other heat sources have shown signs of reducing the plaque in Peyronie's. I've researched many forums and all except one that I've found seem to be solely for the purpose of selling particular services or products. The peyronie's society forum is the most honest, straight forward site I've found. It is by, for, and with other peyronie's sufferers. You will find a lot of excellent information there. Everyone's experience is different. Good luck and blessing with your journey through this condition.
As for heat, the idea is to use a heat source which will penetrate to heat the plaque formation but not so much that it will destroy the tissue.