What Causes A Burning Injury On The Shoulder?

K The weirdest thing I keep a knife under my pillow open for protection well about a week ago I noticed bye my shoulder line of my shirt I thought I had cut myself it looked like the top of my knife well I was picking at it and it got too be like a leaf and in started too heal well that protection layer u pick on scabs that heals well I started pulling that off in the middle it was tougher than normal and hurt more towards the end of it so I went too cut it off and I just kept pulling and something was weird so I pulled and it hurt it looked like a skeletal cocoon of some sort with little sea looking thingys along the borders well it look like it was starting too borrow in my skin I cleaned it all up nice and is already healing another thing I noticed I was really sick few days back couldn t stop throwing up it burns now the sickness is gone I saved them in a pill bottle for identification purposes thanks geno