Skin tags that have changed color or bleed may require your doctor's evaluation and reassurance. Rarely, thrombosed skin tags may be a sign of another condition and need to be biopsied.
The x-axis and y-axis are two lines that create the coordinate plane. The x-axis is a horizontal line and the y-axis is a vertical line. I'm sure you've heard that a million times, but it might hard for you to remember which one is which. Here is a little trick to help you remember...
The x-axis is essentially an infinite number line running horizontally in both positive and negative directions outward from zero. With the use of such a number line, any number can be found and plotted. The y-axis is a similar number line, only running vertically and perpendicular to the first.