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beauty
How to choose a vitamin C serum for your skin type
Beauty How to choose a vitamin C serum for your skin type By Rebecca Marcus, MD · September 2026 · 9 min read Some links in th...
Journal
Journal
Longer pieces on the questions patients ask me most, written so you can act on them. Evidence first, and always what I would tell you in the office.
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pigment
Why tinted sunscreen works better for melasma
A dermatologist on why iron oxides in tinted sunscreen protect against the visible light that drives melasma, and how to choose one.
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pigment
Tranexamic acid: the pigment ingredient that treats both brown and red
A dermatologist on why tranexamic acid works on both post-acne brown marks and redness, the 2–5% that matters, and why formulation decides it.
pigment
Melasma: why it keeps coming back, and what you can do about it
Melasma is one of the most common reasons patients come to see me, and it can be frustrating to live with, because it responds to treatment and the...