When there is a significant red itchy phenomenon in the armpit, the main reason may be eczema, skin allergy, inter-rub rash, etc., to carefully observe the appearance of the affected skin, timely medical examination to determine the cause, the details are as follows: 1, skin eczema: if the itchy area has obvious red spots, papules, consider the simple armpit eczema-like changes, this situation in addition to red itch, but also due to inflammation appeared exudate, vesicles, keratosis, etc. Phenomenon; 2, skin allergy: allergic people local skin stimulated by external inflammatory reaction, will also lead to the patient’s armpits appear obvious red itch; 3, inter-rubbing rash: itchy parts if diffuse flushing, and frictional pain, is considered related to inter-rubbing rash, is due to the arm in the process of activity and sweat, clothing friction, the formation of a local skin changes. Therefore, patients with persistent red and itchy underarms should promptly visit a regular dermatology hospital for treatment under the guidance of a doctor, such as topical application of fluticasone propionate cream and glyburide lotion. In daily life, you should also pay attention to keeping your underarms dry and clean, change your clothes regularly, and don’t wear clothes that are too tight.