I can't be sure but it sounds like pemphigus. My Creamsicle is being treated for it and dermatophilus right now. The black coffee grounds can be around the eyes and mouth and inside the ears and on the pads of the paws and around the anus. Check those places, too. Dr. Lee has Cgirl on zeniquin and he gave her a shot of an anti-inflammatory and it's helped her tremendously. The big black spot on her lip fell off after only one day. If it's pemphigus, it's immune mediated and needs lots of antibiotics because it usually takes a month or more before it's totally gone. Hope this helps.