most helpful answer without being able to examine the area it sounds like either a hemorrhoid or possibly an abscess. however your doctor needs to examine you to exactly determine what it is. in addition to the bump a hemorrhoid is often itchy. it's typically caused by constipation or having to strain more when having a bowel movement. they aren't typically sore but can be especially if they get inflamed. however an abscess is more likely to be tender as it is a bacterial infection with a build up of pus in the area. i have included a couple of links above to help you learn more about both of these conditions. you need to determine exactly what's causing it by seeing your doctor in order to know how to treat it. it could be one of these conditions or something else.
found a bead size bump under the skin right outside of the anal area? what can it be? is a little sore. this is not the 1st time it has happened i did feel it once before about 2 years ago and the same thing it was sore around the area and in the same spot; which is losated to back part of the anal area.