Farmasi tea tree oil sauce serum is the most effective product of the series. It is 100% tea tree oil. It is especially used for acne and blackheads. It is applied to the problematic area and rinsed after waiting. To increase the effect of the product, the face must be cleaned with washing gel and a cleansing tonic must be applied beforehand. Depending on the situation, the healing process may start after a week. Important note: To test whether you are allergic to the tea tree plant, you should try it by applying it to your arm or another part beforehand. Farmasi tea tree oil sauce serum is a very intense and effective oil. It may cause problems on sensitive skin.