Black flies or Ants?

Tully has a few blemishes, it is obviously bites, from black flies or ants. Poor little man, I put some antibiotic stuff on his belly, and it seems to have dulled it down a bit. I noticed that the big black ants have started their annual trek into the house, but the bugs outside are horrendous as well. He is not itching, but it looks horrible. Update: yes, either black fly or ant bites. I am using a light spray of neem to repel them when the dogs go outside.