Scab in left nostril won't go away, 5 months now. Causes nose bleeding every few weeks. Cancer? If not, how can I remedy this? I am a Non smoker.

See ENT doctor. It is not feasible to provide a meaningful opinion without examining you and your symptoms warrant evaluation by a physician. Five months is long enough to wait and watch, it is time to see an ENT doctor and if needed have the lesion removed.