I have some type of fungus on my finger. It started on my knuckle, looked like ringworm dark round cracking skin then when I thought I cured it, it came back on the inside of the same finger where it bends it started to blister up and cracking where my finger bent. the wound became very painful cause I always use my hands, it had a deep crack for awhile until it healed, then in that area I had scar tissue eventually it gone. Now my tip of my finger is the affected it is very hard, skin tearing and very small bumps(blisters) are on my finger from my knuckle and close to my nail, but that s the only place I have them. tip of finger is tearing cause my skin is cracking and tears when I snag it in something also sore