The first is that there is a parasitic infection, mainly including pinworm infection or roundworm infection, usually pinworm infection, there will be adult worms crawl out of the anus to lay eggs will have the feeling of anal itching, parasitic infections need to do stool worm egg detection test, if the eggs found in the stool can prove that there is indeed a parasitic infection, you need to take medicine to treat. Second, if there is anal itching, there may be skin diseases, usually refers to perianal eczema, patients will have the feeling of anal skin itching, scratching more serious, damp skin around the anus, choose to use hormonal drugs or Chinese medicine treatment. Thirdly, consider that there are symptoms around the anus from venereal infections, syphilis, and condyloma acuminata.