Itchy back in summer may be related to physiological factors, or it may be caused by contact dermatitis, insect bite dermatitis, florid chafing and other causes. 1. Physiological factors: in the summer if the personal hygiene habits are poor, often do not take a shower, coupled with more sweating, resulting in sweat and back dirt mixed, the formation of skin irritation, may cause itchy back in the summer. 2. Contact dermatitis: commonly found in allergic people, in the summer back in contact with pollen, dust mites, non-cotton clothing and other substances, is likely to induce contact dermatitis, may cause summer back itch. 3. Insect bite dermatitis: in the hot summer, if the back is mosquito bites, easy to cause mosquitoes spit out toxins in the skin stagnation, is likely to induce insect bite dermatitis, will cause the back itch, can be accompanied by pain, bags and other manifestations. 4. maculopapular furuncle: mainly due to the back of the skin by Malassezia infection caused by the patient’s back local itchy skin, may also be accompanied by local skin rash and other manifestations. Summer back itch, exclude physiological factors, it is recommended to consult a doctor as soon as possible, after the cause is clear, by the doctor to guide the treatment and conditioning.