A red itchy belly button can be contact dermatitis or eczema. In addition, the belly button red itch, there may be scabies and other skin diseases. 1. Eczema: eczema is an inflammatory skin disease of unclear etiology, occurring throughout the body, often symmetrically distributed, lesions manifested as erythema, papules, papules, itching, vesicles and other symptoms. 2. Contact dermatitis: common in contact with certain easily sensitized or irritating items after the occurrence of allergic reactions, mainly manifested as contact with the site of erythema, papules, papules, blisters, itching, tingling and other symptoms. 3. Scabies: This disease is mainly a contagious skin disease caused by the scabies mite parasitized in the epidermis of human skin. Mostly in the body folds parts, such as around the navel, waist, lower abdomen, genitals, etc., lesions manifested as erythema, papules, papules, rash scattered, symmetrical distribution, intense itching and other symptoms. It is recommended that patients combined with their own symptoms, timely to the regular hospital dermatology consultation, follow the doctor’s instructions to clarify the diagnosis, timely treatment, to avoid delaying the condition.