I cannot expand on your latest image to view. I believe it may be a capillary (simplex) lymphangioma. The tongue has many lymphatic vessels and capillaries. Your lesion is very small fitting the capillary size. Have a dentist evaluate it for possible excision.
I don't think it is any cause for concern. As long as it does not get bigger, turn color, or become painful and or ulcerating, I wouldn't worry too much. Fortunately the spot is very small and the body could control the size at this point.