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Try drawing salve with a band-aid over it. Drawing salve will get any thistle that remains in your little one foot and it also draws any infection out at the same time. Is available at any pharmacy department, Walgreens, Wal-mrt, Osco, etc. It really works. I recently had a small sliver in my finger I could not get out and the drawing salve done the job for me.
Check out this web site. http://www.wisegeek.com/what-is-drawing-salve.htm
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