Also known as a pilonidal cyst, the condition forms when a sac of tissue fills with air or fluid in the crease of your buttocks. Pilonidal cyst, doctors say, is mostly caused by a skin infection.

About a month ago, I noticed I had reduced airflow in my left nostril. It never went away for three weeks so I went to the doctor. An X-ray revealed a large, smooth mass in the sinus cavity behind my ...

The maxillary sinus drains into the nose through a hole called the ostia. When the ostia becomes clogged, sinusitis can occur. The ostia of the maxillary sinus often clog because the ostia are located ...