Super weird. Anyone experience Melasma from indoor training?

For a variety of reasons I have only trained indoors over the last 1.5 years. Bike set up in front of 65” television. Probably 3-4’ away.

I’ve developed blotchy dark patches on the top of my bald head and forehead. My dermatologist is convinced it is melasma. And asked if I use screens a lot.

Anyone experience anything like this? I have so many questions and have a hard time believing this is the cause. As I said super weird and random!

WTF, lol.