Blue potion can not be painted wound ulcerated place, blue potion of the main ingredients for the methyl violet, in recent years research has shown that the methyl violet has a certain tendency to cause cancer, blue potion for open wounds will lead to aggravation of the situation, can only be used for the skin has not been broken ulcerated. The main components of the blue drops are methyl viologen and water, which can play a certain bactericidal effect, the bactericidal effect is relatively good, in the past the use of more, more for the skin mucous membrane secondary infection disease. At present, due to the popularity of iodophor and other disinfectant drugs, compared to this type of drug is more safe and effective, blue drops can promote wound scab, but the wound scab can not be completely killed bacteria, easy to infection, resulting in the wound surface healing well but the deep wound infection is very serious, so the blue drops are strictly prohibited to use in the open wound, to avoid deterioration of the situation. Blue drops are rarely used in the clinic, because there are certain safety hazards, in the use of the need to consult a relevant professional doctor, under the guidance of the doctor to regulate the treatment, the choice of less side-effects of the drug to disinfect.