Exploring the Impact of Subclinical Hypothyroidism on Hyperpigmentation: A Rare Presentation in a 42-Year-Old Woman.

Hyperpigmentation of the skin can occur due to internal and external causes. This case highlights an unusual presentation of generalized acute hyperpigmentation associated with subclinical hypothyroidism in a 42-year-old Indian American woman. After unsuccessful trials of various topical agents, the patient exhibited significant improvement in hyperpigmentation after levothyroxine treatment.