If your son has had it a longer time, please take him to a dermatologist. I had it four years, my dr. insisted that I didn`t. I asked him to send me to a dermatologist and that dear man asked how I could stand it that long. He gave me the strongest oitment he had and in 30 days it still was there, then he gave me pills to take for 30 more days. It can get in the blood stream.