Exactly correct FluffyLove and great advise thank you.
Hey Bradd, if you can't express his anal glands, (not hard to do, check out youtube) then bring Otis to the vet and let them do it. Only takes a few minutes and should only cost about 15 bucks. One of mine needs her anal glands emptied occasionally. I know it's time when she starts dragging her rear across the floor and doing the "butt scoot boogie". The pressure from the build up of fluid is uncomfortable for them and eventually if left go results in the glands leaking as you found out. Hope all is well with you and Otis.