The first thing to do is to wash and dry the affected area with warm water and soap before applying the medication. The amount of medicine and the range of medicine to coat the warts shall prevail, coated with medicine and then slightly rubbed into the warts body, try to avoid contact with normal skin and mucous membrane. What do I need to pay attention to when using tincture of demodex? 1. This medicine is for external use only and should not be taken orally. 2, the drug should not come into contact with the eye. If it accidentally enters the eye, rinse it with water immediately. 3, immediately after the use of the drug tighten the cap to prevent evaporation of the liquid. 4. Not allowed for pregnant and lactating women. 5.There is a lack of experimental data on the use of drugs in children, and it is recommended that children should not use the drug. If you encounter any problems in use, please consult your physician promptly.