It sounds like your pup is getting the telltale “raccoon eyes” that comes with localized demodex. The first step is to go to a vet and get medication for it. It WILL get worse the more he itches and rubs it, and then you run the risk of secondary bacterial/yeast infections springing up. If the area is small enough, they may be able to treat it with ointment-dips and ivermectin orally are also treatment methods used, Next, be sure you are feeding a really high quality dog food.
We took in a doxie that had localized demodex and the idiot breeder did nothing about it-until it was generalized and the poor thing stunk so bad it even made us gag. Her solution was to dump the dog on rescue and it took 6mths of daily meds plus dips to clear it.
