'ringworm' originates from Middle English, specifically the word 'ringworm', where 'ring' referred to the circular shape of the rash and 'worm' was a misinterpretation of the cause.

'ringworm' changed from the Old English word 'hringwyrm' and eventually became the modern English word 'ringworm'.

Initially, it meant 'a circular rash caused by worms', but over time it evolved into its current meaning of 'a fungal infection causing a circular rash'.