Why are the tips of my dog's ears rough after a visit elsewhere?

Post date: 2018-04-24 18:12:49

After coming back from staying a couple weeks with a friend (who also has dogs), our pup Otis has rough skin on the tips of his ears. What could this be? Here are three pics of the dude, two before and one after: https://imgur.com/a/IntOphK

It was immediately obvious that it was different, and at first we thought it was scabs from play-fighting with the other dogs or something, but it hasn't improved in over a month and we're wondering if it's actually something else, like mites or mange?
He seems sensitive about them if you try to gently hold them and look closely, but then again he might have been sensitive about that before too. They do not seem to itch or bother him at all.

Is it obvious what it is? Should we just take him to the vet?

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