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At night if my husband drools, it will stain the pillow cover purple where it hits. This happens no matter if he is at home, in a motel room, or visiting family. Why does his drool stain purple?
This started about 6 months ago. No new medications etc. but his Niacin dose was increased a couple of months before we noticed this happening. Is there a connection? What type of doctor should he see for this, if any?
Is there any history of gingivitis or other dental pathology ?
Since how long is he having these symptoms ?
Any investigations done so far ?
In my opinion Niacin can't cause the drooling.
An Ear Nose Throat Surgeon should be consulted.
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Why does the saliva stain the pillow purple? It is all pillows, not just the one's in our house. This has happened to pillows in motel rooms as well.
Saliva is usually colourless but purple saliva depends upon the type of dinner taken.
The first explanation that comes to mind is that there is some amount of iodine in your husband's saliva - either from the gum cleansing, or from the toothpaste, or from seafood (if he eats these at dinner). Iodine in saliva will be colorless, but if it comes in contact with starch in the pillowcase, it will turn purple. A cotton pillowcase may have starch added to it. Or, since cotton itself contains some amount of carbohydrates (starch is also a carbohydrate), it could react to the iodine, if any.
Another explanation (a bit far-fetched), is the excretion of Niacin in the saliva. Niacin turns purple when it comes in contact with potassium or with chemicals like cyanogen or barbituric acid. But then why should these chemicals be on your pillowcase? I have no idea - like I said earlier, the idea is a bit far-fetched.
I think that the easiest explanation is the reaction of iodine and starch. Perhaps you could try a silk pillowcase - if there is no purple color, then this could be the likely explanation.
I wish I could have helped you more.