blistered

The word 'blister' entered Middle English from Old French, with its ultimate origin obscure but likely imitative or expressive in nature, related to the concept of a swelling. The suffix '-ed' is a versatile Germanic grammatical marker, used here to create a participial adjective describing a state or a past tense verb denoting an action. Thus, 'blistered' literally means 'having acquired blisters' or 'caused to form blisters,' connecting the physical result of injury or heat to the descriptive or verbal form.

Structure: blister (swelling) + ed (adjective/verb suffix) 'blister' (origin uncertain, possibly from Old French blestre, meaning a swelling or pustule); 'ed' (Old English, suffix forming adjectives or past tense verbs).