There are many types of parasites. If they come into direct contact with the skin, they may cause allergic symptoms, and if they are parasitized in the body, they may cause gastrointestinal discomfort, which is harmful to the human body. Parasites include mites, lice, fleas, etc. If such parasites are in direct contact with the surface of the skin, they may cause allergic reactions, itching, pain, erythema, edema of the skin, and in severe cases, fever, headache, diarrhea, asthma and other symptoms. If parasitic in the body, such as tapeworms, roundworms, pinworms, etc., can directly absorb the body’s nutrients, causing gastrointestinal discomfort, diarrhea, abdominal pain, nausea, vomiting and other symptoms, but also may stimulate the urethra, causing frequent urination, urinary urgency, urinary pain and other symptoms. Seriously jeopardize the health of patients. Therefore, once the symptoms of suspected parasitic exposure occur, timely consultation is required.