Mycobacterium marinum infection - Cellulitis DDx
M. marinum infection should be differentiated from cellulitis on the basis of exposure and morphology. M. marinum infection will often demonstrate papules, pustules, or ulceration.
A31.1 – Cutaneous mycobacterial infection
58869008 – Mycobacterium marinum
- Cellulitis has a background of erythema and a more rapid onset and spread.
- The typical pattern of lymphangitic spread can suggest herpesvirus infections (HSV and zoster).
- Cat-scratch disease
- Superficial thrombophlebitis
- Other infections such as sporotrichosis, blastomycosis, coccidioidomycosis, nocardiosis, tularemia, cutaneous tuberculosis, leishmaniasis (Old World and New World), and actinomycosis may have a similar lymphangitic spread from cutaneous inoculation. Exposure and travel history are key for diagnosis.
- Sarcoidosis rarely ulcerates or spreads along lymphatics.
- Cutaneous lymphoma may have associated fevers and weight loss.
- Bacterial abscess has an acute onset.
- Pyoderma gangrenosum bleeds easily and appears vascular.
- Vasculitis does not usually have an exophytic growth pattern.
- Foreign body reaction to sea urchin spines or barnacles.
- Cutaneous anthrax
- Majocchi's granuloma