In case of having following symptoms after using this, you're advised to stop using it immediately. If you keep using it, the symptoms will get worse and need to consult a dermatologist. - In case of having problems such as red rash, swollenness, itching, stimulationduring usage. - In case of having the same symptoms above on the part you put this product on by direct sunlight. You are banned to use it on the part where you have a scar, eczema, or dermatitis.