TRT and acne: separating hormonal fact from bro-science

What did @socalurologyinstitute actually say?

Dr. Gary Bellman is walking back a prior video where he recommended doxycycline for TRT-related acne, and adding nuance based on viewer feedback. His core message: start with topical treatments, escalate to antibiotics only if topicals fail, and consider Accutane in rare severe cases. He also acknowledges that more frequent, smaller testosterone injections may reduce acne severity by flattening hormone peaks. He says it is "very rare for somebody to have to stop testosterone replacement because of acne." That is a reasonably calibrated clinical position, not an alarming overclaim. He is essentially describing a step-up treatment ladder, which is standard dermatologic practice applied to a TRT context.

Does the science back this up?

Mostly, yes. The evidence supports most of what he said, though with some gaps worth naming. The step-up approach for acne management, from topicals to oral antibiotics to isotretinoin, is consistent with guidelines from the American Academy of Dermatology (Zaenglein et al., 2016, Journal of the American Academy of Dermatology). The mechanism is real: exogenous testosterone increases sebum production by activating androgen receptors in sebaceous glands, which is why TRT patients are at elevated acne risk (Melnik, 2011, Journal of the European Academy of Dermatology and Venereology). The claim that more frequent injections may reduce acne is biologically plausible. Supraphysiologic testosterone peaks after injection are associated with greater androgenic side effects, and splitting doses can flatten that curve (Ramasamy et al., 2014, The Journal of Urology). This is not just gym-bro folklore. There is a pharmacokinetic rationale behind it.

What did they get wrong (or right)?

He got the ladder right. The sequencing of topicals before antibiotics before isotretinoin is defensible and responsible. He also gets credit for not overpromising. He does not say acne is inevitable or that TRT should be stopped. Where he is slightly thin: he does not mention that doxycycline carries antibiotic resistance implications when used long-term. The WHO and CDC have both flagged overprescription of tetracyclines as a driver of resistance (WHO, 2019). A dermatologist co-prescribing TRT patients antibiotics without a clear endpoint is a real-world concern, and he glosses over it. He also uses the spelling "Accutene" when the drug is isotretinoin (formerly branded as Accutane), a minor but notable imprecision for a medical professional posting publicly. He is correct that stopping TRT for acne alone is rare, but that framing could inadvertently discourage patients from reporting severe acne to their providers.

What should you actually know?

TRT-related acne is androgenic acne, and it behaves differently from adolescent acne in some respects. It tends to appear on the back, shoulders, and chest more than the face, which is part of why he flags topicals as harder to apply in those areas. That is a practical, accurate observation. If you are on TRT and developing acne, the right first call is to your prescribing provider, not a TikTok comment section. Topical retinoids and benzoyl peroxide are first-line for mild to moderate cases. Oral antibiotics like doxycycline are appropriate for moderate to severe cases, but should not be open-ended prescriptions. Isotretinoin is reserved for severe, nodular, or treatment-resistant acne and requires enrollment in the iPLEDGE program due to serious teratogenicity risks. If injection frequency is a lever your provider is willing to pull, the evidence suggests it is worth discussing, particularly if your testosterone peaks are high and your troughs are low.