Ringworm (noun)

1. A fungal infection of the skin, hair, or nails, characterized by a ring-shaped rash.
2. A common skin infection caused by a fungus that creates a circular, red, itchy rash.

Origin:

Old english wringwyrm, from wring (probably used in the sense "ring") + wyrm "worm".

Examples:

1. The rash on her arm was caused by ringworm, a fungal infection.
2. Ringworm is a highly contagious skin infection caused by a fungus.
3. Ringworm is treated with antifungal creams or oral medication.
4. Ringworm is often spread through skin-to-skin contact or by sharing contaminated objects.
5. Ringworm infection is often characterized by a circular, red, itchy rash.