Why It Happens
Testosterone stimulates sebaceous glands to produce more sebum. Increased sebum clogs pores, creating an environment for acne bacteria. This is the same mechanism as teenage acne during puberty. On TRT, the effect is dose-dependent and usually worst in the first few months.
Where and When
TRT acne most commonly appears on the back and shoulders, then face and chest. It typically starts within four to eight weeks and is worst during the first three months. For many men, it improves as the body adapts to stable levels.
Treatment
Mild acne responds to benzoyl peroxide wash, salicylic acid cleansers, and keeping skin clean after workouts. Moderate acne may need topical retinoids. Severe acne warrants checking estradiol levels and may require low-dose isotretinoin.
Protocol Adjustments
Less frequent injections with higher doses create larger peaks that drive more sebum production. Switching to more frequent smaller injections smooths the hormonal curve and often reduces acne significantly without reducing the overall dose.
When It Resolves
For most men, TRT acne is temporary. The worst occurs in the first three to six months and gradually resolves. Stable protocols with consistent dosing frequency produce the least ongoing skin issues.