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Medical Encyclopedia |
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Definition Return to top
A skin lesion of blastomycosis is a symptom of an infection with the fungus Blastomyces dermatitidis. The skin becomes infected as the fungus spreads throughout the body.
Causes Return to top
Blastomycosis is a rare fungal infection. It is most common in the central and southeastern United States, and in Canada, India, Israel, Saudi Arabia, and Africa. A person gets infected by inhaling fungal particles that are found in moist soil, particularly where there is rotting vegetation. People with immune system disorders are at highest risk for this infection.
The fungus enters the body through the lungs, infecting them. The fungus then spreads (disseminates) to other areas of the body. The infection may affect the skin, bones and joints, genitourinary tract, and other systems.
Skin symptoms occur in about 80% of people infected with blastomycosis. It is a sign of widespread (disseminated) infection. Skin lesions may look like warts or like ulcers. They may also affect the nose and mouth.
Symptoms Return to top
With time, these lesions can lead to scarring and loss of skin color (pigment). The lesions are most frequently found on exposed body areas.
Exams and Tests Return to top
The infection is diagnosed by identifying the fungus in a culture taken from a skin lesion. This usually requires a skin biopsy.
Treatment Return to top
This infection is treated with antifungal drugs such as amphotericin B, itraconazole, ketoconazole, or fluconazole. Either oral or intravenous (directly in the vein) drugs are used, depending on the form and stage of the disease.
Outlook (Prognosis) Return to top
What happens depends on the form of blastomycosis and the individual's immune system. In immunosuppressed individuals, long-term treatment may be required to prevent symptoms from coming back.
Possible Complications Return to top
When to Contact a Medical Professional Return to top
Some of the skin problems caused by blastomycosis can be similar to skin problems caused by other illnesses. Tell your doctor if you develop any worrisome skin problems.
References Return to top
Kauffman CA. Blastomycosis. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 355. Update Date: 9/28/2008 Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
