Alter some Images

Hello everyone, For a story I am working on, I need photos of arms and legs (but predominantly arms) edited to look as though they have been cut, and are bleeding. I would like the photos to appear progressively cut. What I mean by this is that initially, I would just like there to be a small cut, with a small amount of bleeding, and for it to build up from there in the other photos. It doesn't matter which photos you use for which part of the story. Naturally I would like the photos to look realistic, so I will also attach a photo of the knife. If you have any questions, please let me know. You don't have to use all the photos - 5-6 would be plenty. Many thanks in advance!