Hypodermyasis is a parasitic infection by the larvae of warble flies, most notably "Hypoderma lineatum" and "Hypoderma bovis". These flies mostly infect cattle in the warmer areas of the northern hemisphere. Humans become hosts when they inadvertently swallow the eggs of those flies.

The symptoms of this infection depends on where the larvae migrates into the body when swallowed, however the most common symptoms are :

- Swelling

- Symptoms resembling those of an allergic reaction

- Skin eruptions

- Eye and neurological symptoms.