Sowda

Sowda is a skin condition that is primarily found in East Africa. It is characterized by a single, large, hyperpigmented, and hyperkeratotic lesion. The condition is caused by the parasitic worm Onchocerca volvulus, which is transmitted through the bite of a black fly (Simulium species).

Epidemiology

Sowda is endemic in certain regions of East Africa, particularly in Sudan and Ethiopia. It is more common in individuals who have been exposed to black flies, which are the vectors for Onchocerca volvulus.

Clinical Presentation

The primary manifestation of Sowda is a single, large, hyperpigmented, and hyperkeratotic lesion. This lesion is typically found on the lower limbs, but can also occur on the upper limbs or trunk. The lesion may be accompanied by intense itching and swelling of the affected area.

Pathogenesis

Sowda is caused by the parasitic worm Onchocerca volvulus. This worm is transmitted through the bite of a black fly. Once inside the human body, the worm produces microfilariae, which migrate to the skin and cause the characteristic lesions of Sowda.

Diagnosis

The diagnosis of Sowda is typically made based on the clinical presentation and history of exposure to black flies. Skin snips may be taken to identify the presence of microfilariae.

Treatment

The treatment for Sowda involves the administration of Ivermectin, which kills the microfilariae. In some cases, surgical removal of the lesion may be necessary.

Prevention

Prevention of Sowda involves controlling the population of black flies and avoiding exposure to these flies.

See Also

• Onchocerciasis
• Dermatology
• Parasitology

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