Hi - you can use oil as soon as your scars are fully healed, usually about 4 weeks. If in doubt, ask your BCN to check them. Please be aware that Bio Oil contains mineral oil and is not a fully natural product. The complementary therapist at my cancer centre recommended using natural calendular oil or rose hip oil. She also advised me to massage the scars with dry hands and then apply oil afterwards. For anyone with raised/keloid scarring, the sticky silicone patches work best in my opinion - ask your BCN or pharmacist. Hope that helps.