Thanks for the info. I noticed otter are interested in mink musk sometimes.

I do not know if otters use their skunk glands to mark their territory, but I have seen where they have gathered up a fist full of debris on the bank to create what looks like to me like a territory marker. Sometimes I will find several of them on a dirt road which is above a salt marsh stream. The appearance of several of them indicates that otters mark this area every time the swing through on their loop. They do not noticeably reek of anything, and they are not created by beavers as there are no beavers anywhere near one of the areas where I found them. I have caught several otters there in snares set for raccoons.

Where do they sleep? Inside the den of whatever they had for dinner most likely.
"Papa was a rolling stone. Wherever he laid his hat was his home.
But when he died, all he left us was alone." So is the life of an otter.

Resting areas or toilets are marked by otters so that other otters know of their having passed through. I find those little piles of scratched up vegetation reek of otter urine. Scats are often accompanying these. Toilets get an extra amount of attention during the rut.