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 follicle, ...

With cold and flu season comes an increased risk of sinus infections, which can trigger a runny nose, sinus pressure, congestion and postnasal drip, among other bothersome symptoms. Fortunately, you ...

A pilonidal sinus is a small tunnel that develops at the top of the crease in the buttocks. Trapped hair around the buttocks crease can lead to an abscess, and a pilonidal sinus may develop as a ...

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Allergic rhinitis (allergies or hay fever) and sinusitis (sinus infections) can cause similar symptoms, making them difficult to tell apart. However, they have different causes and treatments.