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What you are seeing might be a skin condition (dermatitis) or be from fly bites, ear mites or even mange. Here is some information on mange and allergies
You can read up on allergies here:
Various causes are discussed here:
It may also be ear margin vasculitis which causes redness and sores on the ear edges. Tick borne disease and auto-immune diseases can cause this. A biopsy can be done to see if your dog has this condition. Blood tests can also be done to check for these diseases. An over the counter hydrocortisone ointment can be used to see if it helps until testing is completed if you think this is a possibility. Tacrolimus (Pro-Topic) 0.1%" ointment might help with any scabbing and bleeding with this condition. Some vets use this In combination with Pentoxifylline This drug increases blood circulation. These two medications together seem to work to clear up this problem.
You will want to get this checked out by your vet to determine the cause so appropriate treatment can be given. In the meantime you might try some Neosporin or triple antibiotic cream on them to provide some relief if it is bother him.
Now you can give him some benadryl to help with any itchiness and inflammation in case it is the result of an allergy. Benadryl is dosed at 1-2mg per pound every 8 hours. If Sampson is indeed under a year of age, I'd go ahead and get a skin scraping done to check for mites. Caught early, it may only take a few treatments to get rid of them.
In the meantime, triple antibiotic cream, neosporin and even vasoline will help keep the flys away.
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