If your 4-year-old child has large blisters under their toes and their skin on the sole of the foot seems to be "peeling off," it is recommended to seek medical advice. Provide details such as any other symptoms your child may be experiencing, how long they have had this problem, whether this is the first occurrence, if they are wearing appropriate footwear, if they are experiencing any pain, etc. It is important to address these concerns promptly for proper diagnosis and treatment.