The cause of eczema on the neck is not clear, and may be related to a variety of internal and external factors. 1. Internal factors: such as chronic infectious diseases (acute and chronic inflammation), endocrine diseases (diabetes, menstrual disorders, pregnancy), mental factors, genetic factors. 2. External factors: for example, taking fish, shrimp, beef, lamb, or inhalation of dust, pollen, dry external air environment, abnormal temperature, local friction stimulation, cosmetic stimulation, contact with animal fur, etc., may induce eczema. Eczema on the neck may cause local skin redness, pimples, blisters, itching, dry skin, moss-like changes and other symptoms, you should consult a doctor in time, follow the doctor’s instructions for treatment.