Differential Diagnosis for a Boil on the Buttocks
- Single most likely diagnosis
- Furuncle (boil): This is the most likely diagnosis, as a boil is a common skin infection that can occur anywhere on the body, including the buttocks. It is usually caused by Staphylococcus aureus bacteria and presents as a painful, pus-filled nodule.
- Other Likely diagnoses
- Carbuncle: A carbuncle is a cluster of furuncles that can occur on the buttocks, causing a larger, more painful lesion. It is also caused by Staphylococcus aureus bacteria.
- Folliculitis: Folliculitis is an inflammation of the hair follicles, which can cause a boil-like lesion on the buttocks. It can be caused by bacterial or fungal infections.
- Abscess: An abscess is a collection of pus that can occur on the buttocks, often caused by a bacterial infection. It can present as a painful, swollen nodule.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Necrotizing fasciitis: Although rare, necrotizing fasciitis is a life-threatening infection that can occur on the buttocks, causing severe pain, swelling, and skin necrosis. It requires prompt medical attention.
- Cellulitis: Cellulitis is a bacterial infection of the skin and subcutaneous tissue that can spread rapidly and cause serious complications, such as sepsis. It can present as redness, swelling, and warmth on the buttocks.
- Rare diagnoses
- Hidradenitis suppurativa: This is a chronic skin condition that causes recurring, painful abscesses and nodules on the buttocks and other areas of the body. It is relatively rare and can be difficult to diagnose.
- Pilonidal cyst: A pilonidal cyst is a rare skin infection that occurs on the buttocks, often caused by a bacterial infection. It can present as a painful, swollen nodule.