'blotchy' originates from the word 'blotch', which is derived from the Middle English word 'bloche', meaning 'a spot or stain'.

'bloche' transformed into the modern English word 'blotch', and eventually became 'blotchy' to describe something with blotches.

Initially, it meant 'a spot or stain', but over time it evolved into its current meaning of 'having irregular spots or patches of color'.