Hi Dear, Welcome to HCM. Understanding your concern. As per your query your child have symptoms of swollen and inflamed gums with blister on tongue which is mainly because of herpetic gingivostomatitis, it occurs because of poor immunity of body and infection caused by herpes virus. Need not to worry about it, it is very common occurrence among children. Maintain proper hygiene of oral cavity of child. Take wet cloth and swipe it around gums of child to prevent deposition of microorganisms. Antiviral drugs such as acyclovir is very effective for treatment , give it with plenty of fluids as it can cause dehydration in child. Give antipyretic medication such as Crocin to get fever lower down. Sharp-edged foods should be avoided. A soft-bristled toothbrush should be used, and the teeth and gums should be brushed carefully. If condition keeps on persisting visit pedodontist once and get it properly examined and start treatment accordingly. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari