Hello~I am not a doctor, but it sure sounds to me like it is infected, I would certainly see your doctor, especially since you are grooming dogs all day, you don't want any of that type of dirt,etc to make it worse. The fact that it is getting redder and redder is also a red flag and the greenish ring??? That does not sound good, please have it looked in to sooner rather than later.
Hi, sorry you have this. I hope it isn't infected. Does it hurt? Does it feel hot? If it hurts I would see a doctor. Is it a puncture or a superficial wound? If superficial you can put Neosporin (triple antibiotic) ointment on it and a bandage. You don't see any red streaks coming out of it do you? Do you have a fever? If you do then definitely go in. It sounds like you are saying it is getting worse not better right?