Brownish black thing in my back?

i noticed I had a brown mole on my back that when I touched it, it would hurt. Today i felt it and decided to scrap it off with my finger. I squeezed it like you would a pimple and some little brownish blackish ball came out. it looks like it has white inside of it. it looked like one of these seeds a href="http://www.google.ca/imgres?imgurl=http://www.healingdaily.com/detoxification-diet/flaxseed.jpg&imgrefurl=http://www.healingdaily.com/detoxification-diet/flaxseed.htm&usg=__j12Tw2oeL79r1v45JoxXlrjX4WY=&h=192&w=192&sz=8&hl=en&start=0&zoom=1&tbnid=2IZz4Fd3gf987M:&tbnh=148&tbnw=149&ei=euvnTZyzOorKgQf7htmrCg&prev=/search%3Fq%3Dflaxseed%26um%3D1%26hl%3Den%26biw%3D1131%26bih%3D654%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=161&vpy=147&dur=829&hovh=153&hovw=153&tx=130&ty=57&page=1&ndsp=15&ved=1t:429,r:0,s:0&biw=1131&bih=654" rel="nofollow"http://www.google.ca/imgres?imgurl=http:…/a but it is rounded and smaller. Could someone please tell me what this is and if it is harmful. thanks