Clinical Challenge: Pruritic Hyperpigmentation of the Lips
A 22-year-old woman presents with pruritic hyperpigmentation of her upper and lower lips that began approximately 2 weeks previously. She has no other systemic complaints, and vital signs are within normal range. The patient was prescribed oral doxycycline for treatment of recurrent acne 3 weeks previously and denies use of other medications or past adverse drug reaction.
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