Scars are extremely difficult to get rid of – once scar tissue has formed, it takes a long time to disappear. Scars can take several years to fade, and in fact some more severe scars will last for a life time. You have not mentioned how you cut your face and how bad your scar is, or whether it has faded at all in the three years since you had your injury. Obviously, the deeper and bigger your wound was, the more scar tissue there will be, and the longer the scar will take to go away. By itself, the fact that the scar has lasted for three years indicates that it is not a minor one, but it is impossible to tell without actually seeing the scar.
You can try some home remedies regularly, but they will most likely provide only marginal benefit, especially if the scar is a severe one. One remedy is to regularly apply aloe juice or gel, preferably freshly taken off a plant. Aloe plants are quite easily available these days, and the gel taken directly from a plant is thought to be the best. However, if this is not possible, aloe gel is commercially packaged and sold, and this too will do. Besides this, you can try massaging the scar daily with a mixture of honey, turmeric powder, and sandalwood powder. Keep your skin healthy by moisturizing it regularly so as to prevent dryness – healthy skin is more likely to regenerate, and the scar will therefore fade more quickly. Your diet is also of course important in maintaining your skin, and you should ensure that you eat plenty of fruits and vegetables. It is also important to drink plenty of water, as dehydration also makes your skin dull and dry.
If the scar is a small one, you should probably just ignore it. It is unlikely that other people pay as much attention to it as you do – we are usually a lot more critical of our own minor blemishes than other people are. However, if you still think that you should do something to get rid of it, you can visit a skin specialist and find out about other treatment options. Treatments such as dermabrasion, microdermabrasion, and a variety of laser techniques can clear up scarring very efficiently and quickly. The specialist will provide with details on all these treatments, and you can then take a decision.