My 15-year-old son has swollen patches on the left side, on his flank. It doesn't hurt him but it stings a little. What should I do?

In this type of situation, it is best to go directly to a pharmacy and show the lesions to a pharmacist. They will be able to determine if you need a non-prescription product or if a medical consultation is necessary. It is important to seek professional advice to ensure proper care and treatment.