The reason why manganese can not always dress is that manganese has a certain permeability and corrosiveness, long time external application will cause damage to the skin, so it can not always be applied externally. 1. Mangnite, is a kind of traditional Chinese medicine, is a sulfate mineral processed into crystals, because the sulfate has a certain corrosive, and high permeability, long time use will stimulate the skin, and even burn the skin, so it can not be always applied externally. 2. Mangnit has the effect of softening and dispersing (softening and dispersing hard lumps), clearing fire and swelling, diarrhea and laxative (with diarrheal effect of the drug to pass stools), external application has the effect of relieving pain, clearing heat and swelling. When used externally, Manganese needs to be wrapped in gauze and applied externally to the affected area according to the size of the affected area. There is no clear clinical data on the time of the external application of manganese, but the specific frequency and time of use should be carried out in accordance with medical advice, and should not be applied for a long time, so as not to damage the skin. 3. It should be noted that the people who are allergic to the Mannit are prohibited from using Mannit for external treatment, and women who are pregnant or breastfeeding should be cautious about using Mannit.