 [ Symptoms ] i do not think this is staph impetigo or dermatitis  skin infection around corner of mouth and chin i have had it for about 4 months i have tried 3 ointments over the course of time but after a while per ointment it would seem okay and then it would become worse and unresponsive to the topical creamsgel clindamycin phosphate mupirocin and ketaconazole however the symptoms are the same red warm terribly itchy stinging crusting and dry without any application applied i do not know what it is only that it seems like a skin infection [ Disease ] i can not tell you what it is either since i cannot examine the area unfortunately your description is not specific enough to narrow down the many possibilities my suggestion for you since you have battled this skin affliction for four months now with various treatments is to see a dermatologist for a higher level evaluation if you have seen a dermatologist then see a different one for a second opinion i am sorry that i can not help you but there is no substitution or a hands on evaluation