Why is my tongue light blue on the top, but still pink on the bottom?
i woke up this morning and went to brush my teeth, but before i could even get the toothpaste on the toothbrush, i yawned. i noticed in the mirror that my tongue looked light blue! i went into the living room for better lighting, and it still looked light blue on the top! it's still the normal pink on the bottom though! what could have caused this? i have not eaten anything that could have stained my tongue this color, like a popcicle or a lollipop or something, and i have only been drinking water for the last few days. so this is really bothering me, what could it be?