I'm wondering if it's a corn... I definitely need to go to the hospital, right?

Yesterday, I was talking with a friend and heard that they had foot pain and felt something strange. There was a hard, callus-like lump on their foot, and it hurt every time they walked, making walking difficult these days. As soon as I heard the story, I thought, hmm... could this be a corn? I remembered seeing a friend in the military get a corn treated with freezing therapy, so I suggested we take a look. It seemed similar, but I wasn't entirely sure—maybe it was a corn, maybe not. I told my friend that they should get it treated, and my friend said...

I think it's just a callus caused by recent frequent rubbing or pressure, and I believe it can be removed by just scraping it off after a few days. Hmm... I'm a bit worried about it, so I told them to go to the hospital. But I only told my friend to go see a doctor... If it's a corn, I wonder if going to the hospital for treatment is the only option, so I'm curious.