The earlier scan stays on the device. Clearing the browser or switching devices can remove it, so the comparison is for the shopper who comes back on the same device.
The first scan is the baseline. The second is the reason to return. Compare the concerns the store already sells against, such as wrinkles, pores, acne, pigmentation, oiliness, and dryness. Do not tell the shopper the scan diagnosed them. It is a store tool, not a medical opinion.
On the Face Age Shopify app, scan history and a comparison of past results sit on the Plus plan, with a PDF skin report. If pores look the same, the next offer is a pore product already in the catalog. If they look better, the email is simple: here is what you used, here is what to reorder.
Do not put a percentage lift on the page, and do not say the scan treats skin. Say what the photo showed, then recommend the store's own products.
