I had 5-6 dime to nickel sized calluses on the bottom of my foot that were painful when walking. Two podiatrists told me that this would be a chronic problem for the rest of my life. While in their office they would scrap/dig some of the calluses out, mostly the center. But after they did this, the pain was worse when I was in the shower or swimming because they had only made a small hole in the center rather than remove all the dead callus tissue. This hole allowed water to enter and fill up the calluses until they were all white, puffy and the tissue was softened. One day since the tissue was soft - I decided to try to scrap the dead white skin of the calluses off myself with a small scalpel from my Biology lab. And a ton of dead tissue came off easily, but not all. So each time I showered I scraped as much as I could without making it bleed. I did this 4 or 5 times I think and then there wasn't any more dead callused skin left really so I stopped. The holes in my foot were not painful and they gradually went away PERMANTELY. This was 3 years ago and I haven't had any more of calluses since.