Final answer:
The correct plural of lentigo is lentigines, honoring the Latin origin of the word and medical nomenclature rules.
Step-by-step explanation:
The correct plural form of lentigo is lentigines. Lentigo is a term used in medicine to describe a small pigmented spot on the skin, often connected with aging or sun exposure. This word comes from Latin, and many medical terms follow the Latin rule for making plurals. Accordingly, Latin nouns ending in -go typically form their plurals with -gines.