Radiation can delay wound healing, cause wound complications, and would ask about HBOT. Questions also to consider are, have they done any blood testing to see about any deficiencies that may be causing delay in healing, chronic infections, and is he obtaining the right among of nutrients, protein, to assist in healing, maintaining immune system. What type of infection keeps returning, and has an ENT made any ruling on the situation, and no need for any diagnostic scans? Many hospitals have wound management specialists, sometimes associated with HBOT dept, may also be considered

Pentoxifylline is sometimes given for non healing ulcers, ORN, fibrosis from radiation.

Good luck with everything.