Example photos are cropped close-ups, used under their original licences. Illustrations were created for this quiz and are marked as such.

• Ice-pick, rolling and boxcar scar photos from Figure 1 in Jayaprakash M. H. et al., “Morphological Profile of Facial Acne Scars…”, Cureus (2026), doi:10.7759/cureus.110672. Licensed under CC BY 4.0. Cropped for this quiz.
• Sun spots photo by Beyond My Ken, Wikimedia Commons, CC BY-SA 4.0. Cropped for this quiz.
• Post-acne marks photo by AlyssaCVC, Wikimedia Commons, dedicated to the public domain under CC0. Cropped for this quiz.
• Mild uneven texture photo from Figure 1 (panel a, room-light photograph) in Esra Duzdemir, Eda Karaismailoglu and Gulsen Akoglu, “Comparative Evaluation of Video Recording, Tangential, and Room Light Photography in Acne Scar Severity Assessment”, Journal of Cosmetic Dermatology (2026), doi:10.1111/jocd.71161. Licensed under CC BY 4.0. Cropped for this quiz.
• Melasma photo from Figure 3 (panel A, baseline) in Kentaro Oku, “Treatment of Melasma Targeting Dermal–Epidermal Interactions Utilizing High-Intensity, High-Frequency Parallel Ultrasound Beam in Asian Skin”, Journal of Cosmetic Dermatology, doi:10.1111/jocd.70820. Licensed under CC BY 4.0. Cropped for this quiz.
• Enlarged pores, rough texture, fine lines and deeper lines are original illustrations created for this quiz.