Allergic reaction? Cold symptom?

Hey ladies. I’d just call our family doctor but it’s of course a holiday today! My son came down with a virus at Christmas which turned into an ear and eye infection. He’s 19 months. He was given amoxicillin, his first time on antibiotics. He is 5 days into the antibiotics and since yesterday he started developing a very light rash on his cheeks. Do you think it could be related to the antibiotics? Or the virus? Or just a coincidence? The rash is very light as you can see. His symptoms from his illness are improving. He does not have sensitive skin at all.