I have had a cracked corner of the mouth with a circular red area, very painful keeps cracking open for the last 10 days and now have a nostril wth a painful crack. Previously I had a sinus infection with sores in my nose but no discharge. Ointments give relief but do not cure  thanks
Hello, With your history of the recent sinus infection and nasal discharge, I suspect this to be related to the infection. Possibilities include strep, thrush, or virus. Your saliva or nasal discharge may carry the infection to the corners of your mouth.  If you were breathing through your mouth due to sinus congestion, saliva or Chat Doctor.  Did you take any medication for your infection such as an antibiotic? Some antibiotics such as amoxicillin can throw off the natural balance of the oral bacteria in your mouth and cause thrush. If strep is untreated, you may need to add