Doxycycline is a Tetracycline (binds 30s subunit) and is used off label for treatment of Acne. Can cause discoloration of teeth, and is known to be PHOTOSENSITIVE.
This patient had diffuse erythema and mild edema over her face and extremities, most likely from sun exposure while being on the med for Acne.
FA 2019: pg 192
An adverse effect of doxycycline is photosensitivity.