When i was a child I had some surgery in my neck, either for my throat or glands, my parents told me that it was a result of eating too much sugar, my neck swelled and the swelling it had to be removed surgeically.

Now i have a stitch in my neck near the omohyoid (superior belly), and it sometimes discharge a yellow fluid that looks like mucus. Yes its very weird! it comes out when i eat for (like months), and sometimes it doesnt happen for a full year then it comes back... any idea what this could be? and why does it come sometimes and some other it doesnt?

I appreciate your help