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These patches are related to vitamin B deficiency and gastric discomfort. Sometimes, they also have superadded infection of bacterial or fungal origin. I would advise you to start a Multivitamin syrup, deworm the child and apply Candid mouth paint for 4 to 5 days.
Syrup A to Z 5 ml once daily for 30 days, syrup Zentel 10 ml single Stat dose, Enterogermina suspension 5 ml twice daily for three days. Candid mouth paint local application for 4 to 5 days.