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...
vertical suggests a line or direction rising straight upward toward a zenith the side of the cliff is almost vertical. perpendicular may stress the straightness of a line making a right angle with any other line, not necessarily a horizontal one the parallel bars are perpendicular to the support posts.