After some further tries to get to the roots of the problem, I fear that it's as simple as a bug caused by a single mod. First of all, It only appears on a single character, other characters are fine. Secondly, I was able to get rid of the glow briefly, when i healed myself from vampirisim ( which I believed might have caused the problem) and, after I turned back into a vampire via Serana, the bug was briefly gone. As soon as I left the cell I was in, it was back again. :( StefanBuczala, do you use Belua Sanguinare? I was a mod i deinstalled a while ago and thus is not in my LO.