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, ...

A cyst is a sac or cavity that may be filled with pus, semi-solid material, or air. It doesn’t usually cause pain until it gets large. An abscess is a painful, red infection that’s filled with pus. A ...

A branchial cleft cyst is a birth abnormality that occurs on one or both sides of the neck. This atypical tissue may form fluid-filled sacs or passages that drain fluid on the neck surface. These ...

Boils and cysts both look like bumps on your skin. The main difference between a cyst and a boil is that a boil is a bacterial or fungal infection, and is more likely to be painful. A boil (furuncle) ...

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What Is a Dentigerous Cyst? A dentigerous cyst, also called a follicular cyst, is the second most common type of jaw (odontogenic) cyst. It's a fluid-filled sac that develops in your jawbone over a ...

Ovarian cysts are common in females of reproductive age. Most of them are harmless, but some may rupture. A sudden, sharp pain in the lower abdomen, with nausea and vomiting in some cases, can ...

A new study opens new avenues for combating soybean cyst nematodes, the most damaging pest for U.S. soybean crops. Targeting a newly discovered vulnerability in the signals that cyst nematodes use to ...

A prolonged course of antibiotic therapy dramatically reduces the risk of recurrence in patients with renal cyst infections in the context of autosomal dominant polycystic kidney disease (ADPKD), a ...

A photo of a cyst nematode's head viewed through a high-power microscope shows its esophageal glands, which produce effectors it uses to infect host plants. The image was digitally edited to highlight ...