<unk> , also known as "Tinea", is an infection of the skin, characterized by a reddish to brownish raised or bumpy patch of skin that may be lighter in the center, giving the appearance of a 'ring'. Contrary to its name,<unk>  is not caused by a worm but by parasitic fungi (Dermatophytosis).  It can exist anywhere on the body.
Fungi are tiny organisms that survive by eating plant or animal material, those that cause parasitic infection (dermatophytes) feed on keratin, the material found in the outer layer of skin, hair, and nails. These fungi thrive best on skin that is moist, hot, and hidden from the light. Together with the other dermatophytosis, up to 20 percent of the population has one of these infections at any given moment.
Ringworm
Pinworm
Hookworm
Flea
Arthropod
Schistosoma
Medicinal leech
Tumble weed