Chin and neck junction itch. What's going on?

The chin and neck junction is itchy, may be wearing high-necked chemical fiber material or other special materials of clothing, occurred allergy phenomenon. May also be laundry detergent or detergent did not wash clean, resulting in skin allergy, you can change a low-necked clothing. If there are serious itching or redness and other symptoms, should be timely to the dermatology department for treatment.