Professor Yu gave up medicine and devoted himself to literature. Professor Zhang has not returned to China so far. I have uploaded the detailed information to Baidu Encyclopedia. Just search the south and the rest and the north.

Now there are no good acne doctors in the whole southwest, only some people cheat people with folk remedies, and there is no reasonable prescription. I can only express my regret for your question. In fact, if you are under 30, you don't have to be too nervous. Just pay attention to personal hygiene, eating habits and living rules. I had the privilege of talking with Professor Yu for some time. If you treat him, you will also pay attention to these problems. If you don't get better after three months, take medicine.