What is good for a corn?

Hi,
A friend of mine has a corn that is irritating him.
I thought of DMSO, but wasn't sure if this would help his corn.
Could someone please comment on what would be good for a corn?
Thank you,
Joe

A quick google search suggests using a pumice stone to scrape the skin area after a bath that softens the skin.
I suggest using MMS in a bath and epsom salts to soften and then either cut or scrub it of.
I had a severe calluse on my foot and a few others not as bad. The big one split and was painful to walk. But after a while of using MMS in bath and jacuzzi tub, and scraping the dead skin away my situation is a lot better.
Hope it helps your friend.