Fix the light

Use the same window, time of day, and camera exposure. Changing shadows can look like changing texture.

Fix the frame

Mark the distance and use neutral expressions. Compare at realistic intervals, not every morning.

Keep context

Travel, cycle, climate, and routine changes belong beside the image. A photograph is one data point, not a diagnosis.

Educational cosmetic content only. It is not a diagnosis or treatment plan. Seek appropriately qualified care for persistent, severe, or concerning symptoms.