Tretinoin and skin purging: separating fact from TikTok hype

What did @drsomjiskin actually say?

The creator, who identifies as a skin doctor, walked through tretinoin basics for a TikTok audience. The core claims: tretinoin is "the strongest topical retinoid you can put on your skin," it causes purging in "the first six to eight weeks," and the best approach is to "start low and go slow" using a weekly-to-three-times-weekly titration schedule. They also recommended ceramides and "glittering" (likely meaning glycerin, or perhaps a slip of the tongue for a humectant) on non-tretinoin days to protect the skin barrier. The video closes with a list of benefits including pigmentation improvement, acne treatment, and anti-aging effects.

There's a noticeable concentration error buried in the middle of the video that we'll get to. But the overall frame, retinoid titration to reduce purging, is a legitimate clinical concept that deserves a fair look.

Does the science back this up?

Mostly, yes. The slow titration approach has real evidence behind it, and the ceramide recommendation is grounded in barrier science. But "purging" as a mechanism is more complicated than the video implies, and calling tretinoin the strongest topical retinoid available is simply not accurate.

Tretinoin works by binding retinoic acid receptors (RARs), accelerating keratinocyte turnover and increasing epidermal cell shedding. That acceleration is what drives the initial flare of comedones and inflammatory lesions in acne-prone skin. Kligman et al. documented this retinoid dermatitis phenomenon decades ago, and it remains well-characterized. A 2022 review by Mukherjee et al. in the Journal of Clinical and Aesthetic Dermatology confirmed that low-concentration initiation and gradual frequency increases significantly reduce the incidence of retinoid-associated irritation without meaningfully compromising long-term efficacy. The ceramide recommendation also has support: studies by Draelos (2008, Dermatologic Therapy) showed that co-applying barrier repair emollients during retinoid therapy reduced transepidermal water loss and patient dropout rates.

What did they get wrong (or right)?

The concentration range cited is wrong. The creator said tretinoin ranges "from 0.025 up to 0.01." That's backwards and incomplete. Standard tretinoin concentrations run from 0.025% at the low end up to 0.1%, not 0.01%. This is likely a verbal slip, but on a video with 295,000 views, a concentration error in a prescription retinoid context is not trivial.

The claim that tretinoin is "the strongest topical retinoid" is also inaccurate. The creator briefly mentions tazarotene as "a little bit stronger," which contradicts the headline claim. Tazarotene 0.1% is generally considered more potent than tretinoin 0.1% due to higher receptor selectivity, and adapalene, while milder, rounds out a spectrum that makes "strongest" a misleading shorthand. Credit where it's due: the six-to-eight week purge window is consistent with clinical data, and the titration protocol described (once weekly, then three times weekly) mirrors guidance from the American Academy of Dermatology. The barrier support recommendation is also sound practice.

What should you actually know?

Tretinoin is a prescription retinoid, and that matters. It is not available over the counter in most countries, and the concentration you use should be determined with a licensed clinician, not a TikTok comment section. The titration principle the creator describes is real and useful, but the specific schedule should be individualized based on your skin type, history of sensitivity, and whether you're using other active ingredients concurrently.

The "purge" framing is also worth questioning. Not everyone experiences it, and it is not a reliable sign that the product is working. Some dermatologists argue that a true purge is brief (four to six weeks) and self-limiting; prolonged worsening may indicate irritant dermatitis or an incompatible formulation, not a beneficial clearing process. If your skin is getting significantly worse after eight weeks, that's a reason to consult a clinician, not push through.

One thing the video does not mention: tretinoin is a teratogen. Anyone who is pregnant or planning to become pregnant should not use it. This is a standard clinical warning that should accompany any public-facing tretinoin content, and its absence here is a gap worth noting.