Your skin changes after a new product. Calling every reaction purging can hide the question that matters: what did you use, and what symptoms appeared? Timing alone cannot tell you the cause.

Some acne-treatment labels describe early worsening. That guidance belongs to the named medicine, not every moisturiser or serum. The same label can also warn about irritation that needs attention.

Write down the product, the first-use date and what happened. New bumps, persistent burning, itch and blisters are different observations. The checklist organises information; it is not a diagnostic test.

Severe, persistent or worsening symptoms need assessment. Stop a suspected new cosmetic if it is causing a reaction. For a prescribed treatment, follow its safety instructions and contact the prescriber or pharmacist.

Do not add exfoliants or extra actives to correct an unexplained reaction. Keep packaging and useful photographs. You do not need to deliberately repeat a concerning exposure to prove that it happened.

An internet six-week rule cannot decide what is happening to your skin. The full guide helps you record the details and recognise when a skincare question needs individual assessment.