2.1 A pilonidal sinus is a small infected tract or a network of interlinking tracts under the skin between the buttocks. The exact cause is unknown but it may be from loose hairs pushing into the skin ...

An anal abscess is a collection of infected fluid, or pus, around the rectum or anus. Symptoms include pain, inflammation, constipation, and a discharge of pus. Share on Pinterest PER Images/Stocksy ...

Bartholin cysts are common fluid-filled lumps that form near the opening of your vagina. When infected, they can become abscesses, which can have more severe symptoms and require different treatments.