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Living with Creeping myiasis

A rare skin condition caused by bot fly larvae burrowing under the skin.

Understanding Creeping myiasis

Creeping myiasis is a rare skin condition caused by an infestation of the larvae of horse or cattle bot flies.

Horse bot fly larvae enter the skin and make tunnels in its upper layers, where they can move for up to several months. This causes winding, red, very itchy lesions. Cattle bot fly larvae go deeper under the skin and cause more painful red lesions, which usually go away after hours or days when the larvae move on to another area.

Signs & symptoms

GARD doesn't list a full symptom list for this condition. Its summary mentions these:

  • Winding, red skin lesions
  • Intense itching
  • Painful red skin lesions
  • Lesions that move to new areas

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

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

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

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
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 rare disease patient organizations for support
  • 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
How is the diagnosis confirmed?
What treatment removes the larvae and eases the itching?
How can I avoid contact with bot flies in the future?

Quick facts

It is caused by infestation of the skin by larvae of horse or cattle bot flies.

Infectious

Also known as: migratory myiasis; myiasitic creeping eruption

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Creeping myiasisGARD ID 1609 · 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 Creeping myiasis.

Explore the Creeping myiasis blog

Explore research for Creeping myiasis

Explore actively recruiting Creeping myiasis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Creeping myiasis 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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