I can't see the whole picture so good but you should def go to dermatologist! I have pyoderma (it's healed now, thank god). My main issue was pain, it was so painful that i just lie on my back in bed cos i just couldn't move cos it hurt. I had it near my stoma. My dermatologist said that it usually makes purple edges in the wound. Do you have purple there? Is it growing fast? Is it painful?