A small hole in the ear with pus is considered to be a congenital preauricular fistula. This is a congenital ear deformity, often chromosomal dominant inheritance, usually there is no special symptoms, when squeezed, a small amount of thin mucus and milky white liquid can be seen from the fistula overflow, slightly foul odor, local itching or discomfort can be felt. However, if the secondary infection, without redness, swelling, pain, pus overflow, can also be repeated episodes of long-term infection of the skin near the ear can be ulcerated, scarring, the wound can not heal for a long time, the formation of multiple pus overflow small holes. Treatment if there is no infection, usually do not need treatment; if repeated pus infection, it is necessary to remove the treatment, need to find the fistula as well as the fistula and remove it together, in order to be able to completely cure.