http://video.search.yahoo.com/video...13&l=9&turl=http://ts2.mm.bing.net/videos/thumbnail.aspx%3Fq=669054010313&id=7019714a4d398672c32f94d9244fb095&bid=YRAyyJwbJS9CIg&bn=Thumb&url=http%253a%252f%252fwww.youtube.com%252fwatch%253fv%253dBANkMaLJaY4&rurl=http://www.youtube.com/watch%3Fv=BANkMaLJaY4&sigr=11ag6kjeo&newfp=1&tit="%3BIt+might+be+a+tumor"%3B
The issues with your coins sounds like die issues. A chip off the die near a device will make a raised area on the coins. When you find several of them in a roll, you are seeing die damage and this will continue as long as the die is used. They get worse with time, When bad enough, they replace the die.