I have a lump on the side of my thumb. It has been there more than three months. It looks like a blister ot dead skin. I have tried rubbing it with a pumice stone but that doesn’t work. I went to the chemist in January and they said they didnt know what it was but to try putting pawpaw cream on it to soften it. I tried this and it worked for awhile but the lump is still there. The lump is sometimes itchy and feels rough.