Sounds like he's on Cephalexin. That's what Jake is on too, he suffers the same thing that you showed in your pictures, but he gets it all over his body as well as his face. I tried to not go the antibiotic route and was trying different things, but my husband wasn't wanting to wait and was insistent on antibiotics, so after fighting him on it I finally gave in. We are keeping him on a low dose of the antibiotic until we see the dermatologist, he seems to tolerate it well and it is keeping the acne at bay. Unfortunately his will clear up with it, but come back shortly after we stop the antibiotics. I have started giving him coconut oil with his food and he is on a hypo allergenic food, we have an appointment with a dermatologist in April for him so hopefully we can figure this out.