I thought it was a tick at first, so I went to get something to remove it... As it turned out it wasn't, and when I looked at it good, it was a greenish looking scab. I tried removing it to clean with peroxide, but it seems to be as if his whole skin where to fall off! When it came off it looks kind of slimy and watery... that spot is very irritated and blood comes out of it, it looks pinkish. I'm truly worried about him... What could this be?

There are many things this could be. You'll really need to have this looked at by a vet. No one here can give you a valid diagnosis without having access to your pet.