My 9 yr old son has been having brief episodes of a burning sensation on the side of thumb side index finger. Sometimes its both index fingers at the same time and sometimes its only one side. One time it was only the thumbs. The side of the finger actually turns red. It last for about 10 seconds and then its gone. So far it only has happened about 1/2 hour or so after he wakes up. He said running it under cold water helps. He is on fish oil, multi vitiamin, D3, Probiotics, and B50. (I recently took him off of the B's just in case.)