Itchy covers may be mite-induced allergic dermatitis, because mite bodies, secretions, and excretions can irritate the skin and cause an allergic reaction, leading to itchy skin, erythema, and other uncomfortable symptoms. Patients should wash their bedding frequently and dry it in the sun to sterilize it. In addition, cover quilt itching may be related to urticaria, mosquito bites and other factors. 1, urticaria: when the quilt or clothing and skin friction contact, may be induced by urticaria, the skin surface red spots, masses, and accompanied by obvious itching symptoms, this time in the guidance of the doctor, take antihistamines to relieve symptoms; 2, mosquito bites: mosquito bites venom can stimulate the skin, resulting in intense itching, especially in the case of body temperature leading to itching, itching, and other symptoms. Especially in the cover will be relatively obvious when the body temperature rises, patients will appear itchy skin, goosebumps symptoms. This symptom has a tendency to self-cure, usually should pay attention to personal protection, avoid mosquito bites; 3, other: cover the quilt itch may also be allergic to the quilt cotton wool, fabric and other substances, the patient should avoid contact with such substances, as soon as possible to replace the bedding.