I have a slow growing lump on my inner wrist. It seems to be fluid filled, is not painful, and when I shine a bright led light through it, the resultant color is a yellow hue; it is not opaque. It seem to be unrelated to any acne, as there seem to be no loci of a potential skin opening. It has grown significantly over the last year, though doesn't seem to interfere with the use of the hand. What should I do about it?