Hi Welcome to healhcaremagic After going through your query I concluded that your son has got injury to his shin. He got blisters which are enlarging. It is due to edema and compartment pressure which is leading to blisters. It is unlikely to be due to local application of basitracin. Elevation of foot over pillow will be of use. Active toe movements are useful in recovery and reducing swelling. Analgesic such as ibuprofen are of use as they reduce pain and swelling. Antibiotics are given to control the infection. Vitamin B and C help in recovery. You can discuss your doctor about it. Hope your query get answered. If you have any clarification then please don t hesitate to write to us. I will be happy to answer your queries. You can also write to me directly on below link: https://www.bit.ly/askdrsudhirortho Wishing you good health. Take care.