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Living with Onchocerciasis

A tropical parasitic disease spread by black flies, causing itchy skin problems and eye disease sometimes called river blindness.

Understanding Onchocerciasis

Onchocerciasis is a rare tropical parasitic disease spread by a black fly that can cause skin and eye problems.

The worms live under the skin in nodules and produce larvae found throughout the body, especially in the skin and eyes. Skin symptoms include itching, rash, scarring, and thickened skin. Eye infection, known as river blindness, can cause itchy, red, light-sensitive eyes and can lead to vision loss. About 90% of cases occur in Africa.

Signs & symptoms

Symptoms vary from person to person. GARD describes these in its summary:

  • Itching, sometimes very severe
  • Rash with small pimples
  • Thickened, leathery skin
  • Patchy lighter skin (leopard skin)
  • Itchy, red, light-sensitive eyes
  • Vision loss from eye infection

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include eye disease specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Eye disease specialists (ophthalmologists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Onchocerciasis Elimination Program for the Americas
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What treatment can clear the parasite and protect my eyes?
How often should my eyes be examined?
How can people in my household avoid infection?

Quick facts

Symptoms usually startany time in life

The parasitic worm Onchocerca volvulus causes this disease, passed on by the bite of an infected black fly. Repeated bites increase the number of worms and larvae.

Infectious

Also known as: infection by onchocerca volvulus; infection caused by onchocerca volvulus; onchocerca volvulus infection; onchocercosis; river blindness; robles' disease

Patient organizations

Source: NIH GARD · OnchocerciasisGARD ID 7252 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Onchocerciasis.

Explore the Onchocerciasis blog

Explore research for Onchocerciasis

Explore actively recruiting Onchocerciasis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Onchocerciasis with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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