Dear sister, you have used various products on your skin for three years and failed. Then the doctor also showed that you have been using vitamin C cream for the last three months and you have benefited. We have a lot to learn from here like we must be careful if the product we are using is good for our skin. Currently, various products are sold in the market to harass people. So we should be selective in buying products for our skin. You have written very well and I wish you the best.