My 2 yo son has a large red blotch on his face that has raised white bumps on it as well. He has a smaller red blotch with raised white bumps on the other side of his face. Has progressed within last 1-2 hours. He is also on day 5 of anti biotic drops for pink eye. Not sure if related. That is the first time he s been on the antibiotic drops.
Welcome to the ChatDoctorI have gone through your question. Most likely your child is suffering from an allergic reaction as it has progressed with in hours. It might be also, granuloma annular or annular lichen plans. Anything definite can be said only after proper dermatological examination. I would recommend you to give your son a dose of antihistamine like Spy. Ben Chat Doctor.  If the lesion subside, it will suggest an allergic reaction which might be due to some allergen in surrounding. Try to avoid allergen in future if possible. In case the child do not respond or the condition deteriorates, then immediately consult a dermatologist for definite diagnosis and management. Hopefully this will be of help. Take care