Forbin
Senior Member (Voting Rights)
Every now and then the sheets on my side of the bed turn blue. Bottom sheet worse than top sheet and it's roughly in the shape of my body.
Looking online the closest I can find is bacteria on the skin causing this.
May not be connected, but there is a condition called chromhidrosis in which sweat takes on different colors (including blue). The condition is considered benign, but it can obviously be a source of concern to the patient.
https://www.medicalnewstoday.com/articles/chromhidrosis