@andrewbar Hello and welcome to Connect. I was wondering if you meant infra-red instead of ultraviolet light? UV light is what causes sunburns and is used for disinfection purposes such as to kill germs of surfaces with a UV wand, or in my water filter under the kitchen sink, the last stage is a UV light before the filtered water is stored.

If you meant Infrared, here is a study about that and diabetic neuropathy.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5537484/