Q: My son is 3 years old, his body has always been strong and he eats well, but his hair grows very slowly after it is produced. Since last fall, he started to lose hair in a circular pattern, and his hair has not grown out since he lost it. When I went to the hospital, the doctor said that I needed calcium supplements. However, even after taking a lot of calcium supplements, my hair did not grow. Later, the doctor said that he needed zinc. After taking zinc gluconate for a while, my hair grew back, but it was all white. What is the reason for this? Is it a nutritional deficiency? How can I treat it? A: The “black ring-like hair loss” you mentioned is probably baldness if it is a circular patch of hair loss. First of all, you should take your child to the hospital to see a dermatologist to find out what type of hair loss it is, and you should also look for a pediatrician to see if there is a lack of nutrition. If your child is in good health, eats well, does not have a partial diet, and is not sick, there should not be any problem, and there is no need to take calcium or zinc supplements, let alone long-term zinc gluconate. If it is baldness, hair will often grow out on its own without treatment, and the hair that just grows out may be white and will gradually turn black.