Infection with mites causes mite dermatitis, which may lead to skin-related or systemic symptoms in patients. 1. Skin symptoms: mite dermatitis may occur as a result of mite bites or contact with mite secretions, causing an inflammatory skin reaction. Mite dermatitis tends to occur in the warm and humid seasons of summer and fall, and mainly focuses on skin symptoms, local erythema and edema may appear, inducing intense itching, especially at night, itching symptoms may be aggravated. 2. Systemic symptoms: mites bite the skin to cause itching, intense scratching may induce infection, the patient may appear different degrees of systemic symptoms, such as headache, fatigue, fever, local lymph node swelling and other manifestations. If the patient has skin symptoms, such as erythema, wind, itching, it is recommended to go to the dermatology department of the hospital in a timely manner to make a clear diagnosis.