Cholinergic urticaria is the most common cause of itching and redness of the neck when sweating in the summer. Cholinergic urticaria, sometimes referred to as “generalized heat urticaria”, is often characterized by active or passive body heat, exercise, strong emotions or hot baths. Cholinergic urticaria typically begins with a number of small, dotted bumps surrounded by a large red halo. Many patients experience a tingling, itching, or burning sensation on the skin before the appearance of the dots. The bumps usually begin to appear on the trunk and neck, but can start anywhere on the body. If the symptom of itchy red neck in summer persists without relief, it is necessary to go to a regular hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.