Does testosterone replacement therapy cause acne? We checked

What did @socalurologyinstitute actually say?

The creator, who appears to be a practicing urologist, claims that 10-15% of men on testosterone replacement therapy develop acne, similar to what happens during puberty. His proposed fix: doxycycline, an oral antibiotic, dosed anywhere from once daily for mild cases to twice daily for more severe ones, with some patients needing it indefinitely. He specifically says "don't lower your dose" because it would "defeat the purpose." He also notes acne tends to appear on the back, chest, and behind the ears rather than just the face.

This is a practicing clinician sharing what sounds like real patient experience. That gives it some credibility. But clinical anecdote and evidence-based protocol are different things, and the framing here blurs that line significantly.

Does the science back this up?

The prevalence estimate is in the right ballpark, but the doxycycline-as-first-line recommendation skips several steps that dermatology guidelines actually recommend first.

Studies on androgen-induced acne, including work by Borgia et al. (2004, Journal of the European Academy of Dermatology and Venereology), confirm that exogenous androgen administration increases sebaceous gland activity and can trigger or worsen acne vulgaris. A 2021 review by Ju et al. in Dermatology and Therapy found acne incidence in TRT patients ranging from roughly 5% to 40% depending on the formulation and population studied, so the 10-15% figure is plausible but toward the conservative end.

On doxycycline: it is a legitimate treatment for moderate inflammatory acne, endorsed by the American Academy of Dermatology (AAD) guidelines. But the AAD recommends it as part of a combination approach, typically alongside topical retinoids or benzoyl peroxide, not as a standalone oral monotherapy. Using oral antibiotics alone, especially indefinitely, raises antibiotic resistance concerns that the creator does not mention at all.

What did they get wrong (or right)?

Credit where it's due: the sebum-androgen connection is real, the prevalence estimate is reasonable, and doxycycline is a legitimate tool. The anatomical observation about back and chest acne is also consistent with clinical literature on truncal acne in androgen excess states.

But several things are off. First, telling patients flatly "don't lower your dose" is an oversimplification. Dose reduction or formulation change (for example, switching from injectable to topical testosterone, which tends to produce lower DHT conversion) is a legitimate clinical option that dermatologists and endocrinologists actually use. Second, the protocol he describes, adjusting doxycycline up and down based on severity with some patients staying on it indefinitely, is not how the AAD recommends antibiotic acne therapy. Guidelines specifically warn against long-term antibiotic monotherapy due to resistance risk (Zaenglein et al., 2016, Journal of the American Academy of Dermatology). Third, he never mentions topical options, isotretinoin for severe cases, or DHT-targeted approaches like topical clascoterone, which received FDA approval in 2020 specifically for acne.

What should you actually know?

TRT-related acne is real and undertreated, and most TRT prescribers are not dermatologists. So a urologist flagging this and offering a solution is genuinely useful. The problem is that the solution presented here is incomplete and potentially risky if followed without dermatologic input.

Doxycycline is not the only option, and it should not typically be used as a permanent monotherapy. Patients who develop acne on TRT have several legitimate paths: topical retinoids, benzoyl peroxide, formulation adjustments, or, for severe cases, isotretinoin. Long-term oral doxycycline carries real risks including GI effects, photosensitivity, and contribution to antibiotic-resistant bacterial populations.

• If you develop acne on TRT, see a dermatologist, not just your TRT prescriber.
• Doxycycline is a reasonable short-term tool for inflammatory acne but should not be the default long-term plan.
• Formulation changes (gels versus injections) can meaningfully affect acne incidence and are worth discussing with your prescriber before committing to indefinite antibiotics.
• The "don't lower your dose" advice may be appropriate for some patients but is not a universal rule.

Bottom line

This video gets the basic biology right and identifies a real clinical problem that TRT patients often encounter without guidance. But the treatment advice is oversimplified, skips established first-line topical therapies, and downplays the risks of long-term antibiotic use. A urologist offering dermatology advice without dermatology nuance is better than nothing, but not a substitute for an actual dermatology consult if your acne is persistent or severe.