Guides · Troubleshooting

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Most skincare problems are diagnostic, not commercial. Before you buy anything, work out what is actually happening. Each guide is a decision tree with a timeline, and every one of them tells you when to stop self-treating.

Pro tip

Change one product at a time and write down the date you started it. Nearly every unanswerable skincare question comes from three things changing in the same week.

Skincare information, not medical advice. For a persistent, painful, spreading, or changing concern, see a board-certified dermatologist.