The parasite that hides in your skin for years
In short: Cutaneous leishmaniasis is a parasitic infection that transforms simple skin lesions into lifelong scars. While it often appears as a localized ulcer, the parasite can remain dormant for years—only to resurface as a destructive mucosal disease that can perforate the nasal septum or obstruct the airway.
Cutaneous leishmaniasis (CL) is the most prevalent form of leishmaniasis, primarily caused by the bite of infected female phlebotomine sandflies. The infection occurs when parasites enter the dermis, where they can persist for months or even years. While many infections remain asymptomatic, CL typically manifests as papules that evolve into nodular plaques or ulcerative lesions with raised borders. These lesions are often painless but can become severe if they become secondarily infected by bacteria or occur near joints.
The complexity of the disease lies in its potential for metastasis. In the Western Hemisphere, specific species like L. braziliensis can cause mucosal leishmaniasis (ML). This occurs when the parasite disseminates from the skin to the naso-oropharyngeal mucosa. ML can remain clinically silent for decades, only becoming evident as persistent nasal stuffiness or bleeding before progressing to ulcerative destruction. In some cases, the disease can become life-threatening if it involves the larynx, leading to potential airway obstruction.
The disease is heavily influenced by geography and host factors. While CL is common in travelers, visceral leishmaniasis (VL) is the most severe form, affecting internal organs like the spleen and liver. Furthermore, patients who survive VL may develop post kala-azar dermal leishmaniasis (PKDL), where skin lesions reappear on the face months or even 20 years later. Because there are no vaccines or preventative drugs, management relies on personal protection from sandfly bites and long-term systemic treatments to prevent permanent disability and stigma.
Clinical diagnosis requires careful observation, as CL can coexist with other endemic diseases like leprosy. Because lesions can have distinct morphologies—such as the annular plaques of leprosy versus the ulcers of leishmaniasis—healthcare providers must use histopathological examination and laboratory tools like polymerase chain reaction (PCR) to ensure accurate treatment.
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Sources
- Summary by Intellect · source: Clinical Overview of Leishmaniasis
- Also: Leishmaniasis
- Also: Cutaneous leishmaniasis
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