Red mark in ear?

I recently found this mark on my cat. What could it be?? He is not disturbed by it and isnt scratching more than normally..

Hello- and that's a strange one.  I want to examine it more closely, but best for your vet to do that.  Is it that a blood vessel has broken, causing a contusion / bleed?  Or is it something on the surface?  Another possibility of course may be something external to the cat stuck on there, or some kind of lump / cancer.  I think that your vet should take a closer look.  If a bruise seems like a possibility and there might be a few days to wait, there may be sense in calling your vet for triage (because I cannot be sure what I'm looking at - in case of clotting problems etc).  I would be interested to hear when you find out.