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The description doesn't sound worrying. It can be an allergic response to the antibiotics but plz don't stop them. If its not bothering him nothing needs to be done otherwise a teaspoon of loratidine syp once a day will help. You can always send me a picture when he wakes up.
Best wishes. Please feel free to contact me if you have any further queries or need to follow up. I will be happy to help and guide. Have a nice day.