Thank you. The vet didn't know what it is, the black crust came off and it's raw flash now. She got two injections and antiflammatory medicine. She will be back to the vet tomorrow for a check up. It can be allergy, fungus, virus, bacteria....anything basically. Or autoimmune disorder.
No, it looks more serious. I got an appointment with the vet so she is going there today. The black area seems to be growing and I thuth there might be a cut under her nose, but it's difficult to see. She eats and sleeps well but imI happy that a vet is going to check her out.