Neck ringworm is usually caused by neurodermatitis or ringworm in the neck, which may be caused by mental factors, local irritation, allergies, fungal infections and other reasons. 1. Neurodermatitis etiology: (1) mental factors: due to emotional changes, causing problems in the regulatory function of the cerebral cortex, thus causing abnormal peripheral nerve function, leading to skin reactions and neurodermatitis. For example, emotional tension, excessive worry, sudden changes in the environment. (2) Local stimulation: when the collar is too hard, scratching repeatedly stimulate the local skin, insect bites, sunlight exposure and other stimuli, can also induce the occurrence of neurodermatitis. (3) Allergy: endocrine system function abnormality, gastrointestinal tract dysfunction, the body of chronic foci of infection and cause skin allergic reaction, may also appear neurodermatitis. 2. Ringworm etiology: ringworm is due to fungal infection of the skin with red spots, scales with itching and other manifestations. When ringworm appears on the neck, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment.