Here's why:

* Lichens are symbiotic organisms: They are made up of a fungus and an algae living together. They typically grow on surfaces like rocks, trees, and soil.

* Foot infections are different: Foot infections are usually caused by bacteria, fungi, or viruses that thrive in warm, moist environments.

If you are concerned about something on your foot, it's best to consult a doctor or dermatologist for proper diagnosis and treatment.