Is my plaster supposed to be dark brown and leaking after I shower? Had a mole removed 3 days ago and took off first plaster.

I got a mole removed on my back 3 days ago and today is the day I got to take off my 1st plaster. I had gone shower first and then I removed my plaster but when I removed it, there was a brown liquid coming from the 2nd plaster I have on? Could this be dry blood from when it was removed? I am quite concerned as the second plaster is now covered in this 'dry blood' and I'm not sure if this is how it should be? What is this brown all over my plaster?