It's like magic.
You leave it on for 48 hours on the spot you have a pimple.
Then you take it off and say "well, this silly sticker didn't do anything."
But 1-2 days later, as if by magic, the pimple starts to swell and peel off!
Perfect product.

Make sure to keep it on your foot for two 24-hour periods.
I stick the patch and then put a plaster on top, it helps it stay in place and not stick to the sock and then come off.

Yes, it is effective, it softens the skin in the area and after 1-2 days, after a bath, the hard skin comes off. It needs more applications to prevent the callus from reappearing.

In combination with some ointment, it is just what you need (not together with the patch, but alternating)

It didn't help me with callus removal, but maybe it just wasn't the ideal choice. It also softened the surrounding skin that didn't need it.