One day, a young man brought his mother to see a doctor, saying that she was in great pain and kept scratching her skin, scratching her head and face to the point that a piece of skin was scratched off. Looking at the broken pieces of skin she had scratched off her face, some of which had developed obvious bacterial infections, I was deeply impressed by how uncomfortable the old man had been to scratch her skin like that. Then stopped to ask carefully why the old man would scratch the skin into this, the old man said I always feel that I have a million mosquitoes and small insects flying in front of me, as if they lie on the face, feel very uncomfortable, itchy painful feeling, always have to use their hands unconsciously to repel, to scratch …… listen to her say so, I have some doubts, and turn to ask her son if the old man was autistic or introverted, had any other illnesses, or had taken special medication, etc. He replied that her mother was cheerful, with her family, and optimistic, except that she had recently discovered that she had cataracts that were getting worse. We have come across a few cases like this and told her that she should go for surgery as a priority, and after the cataract was fixed, her eyes would see clearly and naturally this feeling of hers would disappear soon. But her son told me that they saw the ophthalmologist and the ophthalmologist said that they had to treat the skin disease and get the infection under control before they could do the surgery. It was not good to take care of the cataract because she could not see for a month after the surgery. I told her that she could do one eye first, so that the original symptoms would be significantly reduced, and then do the other eye after one eye recovered, so that both eyes could see clearly and there would be no blurred shadows in front of her eyes.