Itchy chin and neck junction may be caused by contact dermatitis or hives, eczema and other diseases. 1. Contact dermatitis: Itchy chin and neck junction may be caused by contact dermatitis. Contact dermatitis is a disease caused by skin contact with external substances, manifested by red spots, swelling, pimples, etc., and the patient will feel itchy. 2. Urticaria: Urticaria is a kind of edematous mass confined to the surface of the skin and mucous membranes, with a variety of causes, such as food, physical stimulation, medication, fatigue, mental stress, and so on. The manifestation of the size of the wind with itching, can appear in the junction of the chin and neck. 3. Eczema: Eczema is a polymorphic rash, symmetrically distributed, and the patient is self-conscious of the itching, which can appear at the junction of the chin and neck. Its etiology is related to genetics, immune abnormalities, hormonal changes, metabolic diseases and so on. Chin and neck junction itch for more reasons (such as ringworm, solar dermatitis), life pay attention to keep the local dry and clean, avoid scratching, itching is recommended to consult a doctor for examination, a clear diagnosis.