i got like a sack under the skin of my rigth foot toe that when it burst it come out like a clear gel no odor no pain except preasure from the accumulation of gel expansion in the tissue , that toe was operated more than a decade ago for the same reason they find like little pieces (about 2) of a black material (foreing material) i never knew what cause the gel (only that was not dangerous). i want to know what it is, it came again to bother me.