The causes of ringworm in the neck are considered to be the following: 1. Tinea corporis, mainly due to excessive sweating, appears as a round or oval patch on the neck covered with a thin layer of bran, and is brown and does not hurt or itch, mainly due to Malassezia, and a fungal smear test can be performed in the dermatology office. 2. Tinea corporis, mainly due to pets kept at home, parasites from the pets This is a fungal disease caused by the transmission of parasites from pets to humans, and may also be due to ringworm that has been untreated for a long time. And red in color, covered with a thin layer of chaff, positive syphilis laboratory test at the dermatology consultation, and may also appear titers. Therefore, for ringworm in the neck, patients are advised to go to the dermatology department of a regular hospital and undergo various laboratory tests accordingly under the guidance of a dermatologist.