I know malignant tumors shows metastasis but benign tumor not. But there is an example of benign tumo?

Some do spread. By definition a benign tumor does not have the potential to spread. Distant spread has occurred when a lesion that is manipulated or curetted has shown signs of spread. This is really not metastasis. A report of benign metastasizing fibroma of the thumb was reported by keasby many years ago. Some benign sweat gland tumors of axilla have been shown to be present in axillary nodes, .