Differential Diagnosis for Arm Abscess
- Single most likely diagnosis
- Staphylococcal skin infection (e.g., MRSA): This is the most common cause of arm abscesses, often resulting from bacterial colonization of the skin and subsequent infection.
- Other Likely diagnoses
- Streptococcal skin infection: Similar to staphylococcal infections, streptococcal bacteria can cause abscesses, especially in the context of compromised skin integrity.
- Cutaneous fungal infections: Fungal infections like candidiasis can lead to abscess formation, particularly in immunocompromised individuals or those with poor hygiene.
- Cat-scratch disease: This condition, caused by Bartonella henselae, can lead to lymphadenopathy and abscess formation, typically after a cat scratch or bite.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Necrotizing fasciitis: A severe, life-threatening infection that requires prompt recognition and treatment to prevent significant morbidity and mortality.
- Gas gangrene: Caused by Clostridium perfringens, this condition is characterized by rapid progression and can be fatal if not treated promptly.
- Tuberculous abscess: Although less common, tuberculous abscesses can occur, especially in immunocompromised individuals or those from endemic areas.
- Rare diagnoses
- Actinomycosis: A rare bacterial infection that can cause abscesses, often in the context of poor dental hygiene or immunocompromised states.
- Mycetoma: A chronic, granulomatous infection caused by fungi or bacteria, typically affecting the skin and subcutaneous tissue.
- Sporotrichosis: A fungal infection that can cause skin lesions and abscesses, often acquired through contact with contaminated soil or plants.