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Troubleshooting your alpha arbutin + niacinamide routine
If new dark patches appear quickly, look very different from your usual acne marks, or come with pain, itching, or bleeding, stop your actives and get them checked rather than trying to cover them with more brightening products.
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Who should be cautious and when to see a dermatologist
You should also seek professional advice if any patch on your skin is changing quickly, hurting, bleeding, or looking very different from your other spots. If every serum you try causes burning or a rash, or your uneven tone keeps worsening in spite of regular sunscreen and gentle care, it is a sign to stop experimenting and book an appointment with a dermatologist rather than relying on home routines alone. [3]