Burning sensation in top of right foot by all toes lasts for 10 sec comes &goes. told docror.not concerned.. not diabetic .. what would cause this?

Varies: There is a nerve on the tip of the foot that supplies that area and is superficial, it is possible that you are developing a neuroma there. I would make sure you are not wearing any shoe wear that could be irritating the top of the foot. There are other potential causes as well. Don't hesitate to see a podiatrist or orthopedist for it.