Treatment may depend on the cause. A sinus infection, also known as sinusitis or rhinosinusitis, occurs when your nasal cavities become swollen and inflamed. Fluid buildup in the sinuses can allow ...

to lessen the symptoms or prevent the infection from worsening. Nasal irrigation is the cleansing of the nasal cavity with sterile salt water to flush out excess mucus or debris from the sinuses and ...

Pilonidal sinus—also called a pilonidal cyst—is a skin infection that occurs in or around the crease of your buttocks. This condition happens when hair, skin cells, and dirt clog a hair ...