The principle of ichthyol extracting pus is that the drug has the ability to reduce swelling and antiseptic properties, which can be used to treat boils. Ichthyol is a disinfectant and antiseptic drug, of which the ingredient is ichthyol. Its medicinal properties are mildly stimulating, and it can reduce inflammation, antiseptic and swelling for boils. However, it is necessary to avoid applying ichthyol to skin breakouts, and do not touch the eyes, oral mucosa, nasal mucosa and other parts of the body. Some patients may experience adverse reactions such as burning sensation, redness and swelling of the skin, once such symptoms occur, you need to stop using the drug and wash the local medication and ask for the doctor’s guidance. It should be noted that the use of ichthyol is contraindicated for those who are allergic to ichthyol components, and allergy sufferers need to be cautious. If this kind of drug is used together with other drugs, drug interactions may occur, it is recommended to ask a physician or pharmacist for guidance before consumption. If the patient in the use of ichthyol treatment, the body abnormal discomfort, need to go to the regular hospital, so as to clarify the cause of the disease.