Final answer:
The moving red squiggly lines on your foot likely represent cutaneous larva migrans, an infection from hookworm larvae that requires medical treatment.
Step-by-step explanation:
The red squiggly lines that moved on your foot may be indicative of cutaneous larva migrans, a skin condition commonly caused by hookworm larva infections, typically acquired when walking barefoot on contaminated soil, such as areas frequented by dogs. The parasites penetrate the skin and cause itchy, serpentine tracks on the surface of the skin as they move underneath. This condition necessitates a visit to a healthcare professional who may prescribe antiparasitic medications to treat the infection.