Cutaneous Leishmaniasis

Cutaneous leishmaniasis is a parasitic infection that affects your skin. It happens when a tiny parasite called Leishmania enters your body through the bite of an infected sandfly. These sandflies are most common in tropical and subtropical regions around the world.

The infection causes sores or ulcers on your skin, usually where the sandfly bit you. These sores can appear weeks or months after the bite. Cutaneous leishmaniasis is the most common form of leishmaniasis. It affects the skin but typically does not spread to internal organs.

Most cases occur in people who travel to or live in areas where the disease is common. This includes parts of the Middle East, Central and South America, Africa, and Asia. The condition is not contagious and cannot spread from person to person through casual contact.

• Painless bumps or nodules on the skin that develop into open sores
• Skin ulcers with raised edges and a crater-like appearance
• Sores that may crust over or have a volcano-like shape
• Lesions that typically appear on exposed skin like the face, arms, or legs
• Slow-healing wounds that can last for months or years without treatment
• Mild swelling around the affected area
• Multiple sores in some cases
• Scarring after the sores heal

Some people may have only one small sore, while others develop multiple lesions. The sores are usually painless unless they become infected with bacteria. Symptoms can take anywhere from a few weeks to several months to appear after a sandfly bite.

Cutaneous leishmaniasis is caused by Leishmania parasites transmitted through the bite of female phlebotomine sandflies. These tiny flies are most active during evening and nighttime hours. They breed in warm, humid environments and are found in forests, rural areas, and some urban settings. The parasites live in the sandfly's gut and transfer to humans when the insect feeds on blood.

Your risk increases if you travel to or live in areas where the disease is common. Outdoor activities like camping, hiking, or military deployment in affected regions raise your exposure risk. People with weakened immune systems may develop more severe infections. Poor housing conditions without window screens or mosquito nets also increase sandfly exposure. Climate change may expand the geographic range of these sandflies over time.

Doctors diagnose cutaneous leishmaniasis by examining your skin lesions and asking about your travel history. A skin sample or biopsy from the edge of a sore is often needed to confirm the diagnosis. Lab technicians look for Leishmania parasites under a microscope or use molecular tests to identify parasite DNA.

Blood tests can detect antibodies your body makes against the parasite. The Leishmania antibody test measures IgG antibodies that indicate exposure to the infection. However, skin biopsies remain the gold standard for diagnosis. Talk to a doctor about specialized testing if you have unexplained skin sores and have traveled to areas where leishmaniasis occurs.

• Small lesions may heal on their own over 6 to 18 months without treatment
• Antiparasitic medications like sodium stibogluconate or meglumine antimoniate for larger or multiple sores
• Topical treatments with paromomycin ointment for simple cases
• Oral medications like miltefosine for certain types of cutaneous leishmaniasis
• Cryotherapy or heat therapy to destroy parasites in the skin
• Keeping sores clean and covered to prevent bacterial infection
• Antibiotics if secondary bacterial infection develops
• Close monitoring to ensure lesions heal properly
• Avoiding sandfly bites to prevent reinfection