Breastfeeding women are able to use ichthyol ointment externally. 1. The main ingredient of ichthyol ointment is 1 gram of ichthyol, supplemented with yellow petroleum jelly, which is a topical drug that is absorbed only through the epidermal skin and does not affect breastfeeding, so it can be used by breastfeeding women. The main clinical use of ichthyol ointment is for skin boils. Before applying the drug, the local skin needs to be cleaned to avoid affecting the effect of the drug. 2. Be careful not to use the drug on skin ulcers or mucous membranes. Some patients may experience localized redness, swelling, burning sensation and other adverse reactions after using the drug, the drug should be stopped immediately, the local drug washed off, and consult a doctor promptly. It is prohibited for those who are allergic to this product, and should be used with caution for those with allergies. It is recommended that patients go to the hospital, under the guidance of a professional doctor to choose the appropriate medication, do not blindly self-medication, in order to avoid adverse reactions.