Your Skincare Works for Everyone Else. Your Acne Persists. Here's Why.

Your androgen receptor is the lock that DHT fits into. It sits on the surface of hair follicles and sebaceous glands throughout your skin. When DHT binds to this receptor, it tells those glands to produce more sebum and tells hair follicles to miniaturize. The more sensitive your androgen receptor is, the more aggressively your skin responds to even normal DHT levels.

The AR gene contains a CAG repeat section. The shorter this repeat, the more sensitive your androgen receptor becomes. This is determined at conception and doesn’t change. People with shorter CAG repeats, which is common across the population, have androgen receptors that respond more dramatically to DHT. This means their hair follicles are more prone to blockage and their sebaceous glands produce more sebum, both of which drive acne.

If you have an androgen receptor that’s extra sensitive, you’ll notice your skin breaks out worse around your cycle (when hormones fluctuate even slightly), or after certain stressors that bump up androgens. You might also notice that your acne is concentrated along your jawline, chin, and neck, where androgen-responsive glands are densest. Your skin might feel oilier than you’d expect for your skin type, and breakouts might appear even when you’re managing hormones well through other means.

SRD5A2 is the enzyme that converts testosterone into DHT, the most potent androgen. DHT is roughly three times more powerful than testosterone at binding to androgen receptors in your skin. The SRD5A2 gene comes in variants that affect how much of this enzyme you produce. If you carry the variant that increases enzyme activity, your body converts more testosterone into DHT, even when your total testosterone levels are completely normal.

The V89L variant (rs523349) is carried by roughly 30-40% of the population. People with this variant have higher 5-alpha reductase activity, meaning they produce more DHT from a given amount of testosterone. This is the primary genetic driver of androgen-dependent acne in genetically susceptible individuals. You can have perfectly normal testosterone on a blood test and still be producing excess DHT because of this single variant.

If you have an SRD5A2 variant that increases DHT production, your acne often appears as deeper, more inflammatory breakouts (not just surface whiteheads). You’ll notice breakouts concentrated in areas where DHT-responsive glands are densest: jawline, chin, chest, and back. Your skin might feel persistently oily, and breakouts often worsen after intense exercise or high-stress periods, when testosterone naturally rises.

CYP17A1 encodes an enzyme early in the androgen synthesis pathway. This enzyme controls the rate at which your adrenal glands and gonads produce androgens from their precursor hormones. If you carry a variant that increases CYP17A1 activity, your body produces more androgens from the ground up, before testosterone even gets converted to DHT. This is a more upstream driver of acne than SRD5A2.

Variants in CYP17A1 are present in roughly 20-30% of the population. People carrying these variants have higher baseline androgen production. Your blood testosterone might be in the high-normal range, or it might be clearly elevated, depending on which variant you carry and how many copies you have. The key issue is that your body is simply making more androgens than the baseline population, which means more substrate available for conversion to DHT and more direct androgen stimulation of sebaceous glands.

If CYP17A1 is a driver of your acne, you’ll likely notice breakouts that are persistent and cyclical (worse in the follicular phase if you menstruate, or worse after any hormonal fluctuation). Breakouts tend to be inflammatory and deep, often with pustules and nodules. You might also notice other androgen-driven symptoms: excess facial or body hair, male-pattern hair thinning, or a deeper voice. Your acne often responds unpredictably to topical treatments because the problem is systemic androgen overproduction.

Your vitamin D receptor sits on cells throughout your body, including in your skin. When calcitriol (the active form of vitamin D) binds to this receptor, it triggers anti-inflammatory and antimicrobial gene expression. Your skin uses vitamin D to mount an immune response against acne-causing bacteria and to reduce inflammatory signaling in sebaceous glands. If your VDR variant reduces receptor function, your skin cells can’t respond properly to vitamin D, even if your blood vitamin D levels are adequate.

VDR variants (BsmI, FokI) are present in roughly 30-50% of the population, depending on ancestry. People carrying variants that reduce VDR function have skin that responds poorly to vitamin D signaling. This means their skin cells are less able to fight Cutibacterium acnes bacteria and more prone to excessive inflammatory responses. Your vitamin D blood test might look perfect, but your skin cells are functionally deficient in vitamin D response.

If you have a VDR variant affecting acne, you’ll notice your acne doesn’t improve much with topical vitamin D treatments, even when your blood levels are normal. Your breakouts tend to be inflammatory rather than comedonal, with a strong immune component. You might notice that breakouts flare after sun deprivation or when stress levels are high (both of which reduce vitamin D and immune function). Your skin might also be prone to other inflammatory conditions like eczema patches or rosacea.

TNF-alpha is a master inflammatory signaling molecule. It’s produced by immune cells and drives inflammation throughout your body. In your skin, TNF-alpha tells sebaceous glands to produce more sebum, amplifies the inflammatory response to bacteria, and increases pore blockage. Some people have genetic variants that cause them to produce higher baseline levels of TNF-alpha. For these people, their skin is always in a more inflamed state, even when they’re doing everything right.

The TNF -308G>A variant (rs1800629) is carried by roughly 30% of the population, with the A allele associated with higher TNF-alpha production. People carrying this variant have a constitutively higher inflammatory tone in their skin. This means their acne is more inflammatory, more likely to scar, and more resistant to standard topical treatments because the underlying driver is excessive immune activation, not just bacterial colonization. Your acne isn’t responding to antibiotics because your problem isn’t bacteria overgrowth; it’s your immune system being stuck in overdrive.

If you have a TNF variant driving inflammation, your acne is almost always inflamed and painful, rarely comedonal. Breakouts feel tender even before they become visible. You might notice your skin is generally reactive to products and environmental stressors. You might also get inflammation in other areas: joint pain after workouts, frequent canker sores, or gut inflammation after certain foods. Your skin might be slow to heal after acne has cleared.

Interleukin-6 is another master inflammatory cytokine. It’s produced by immune cells and by skin cells themselves in response to bacterial presence or physical irritation. IL-6 amplifies the inflammatory cascade that turns a blocked pore into a painful pustule or nodule. Some people have genetic variants or epigenetic patterns that cause their skin cells and immune cells to overproduce IL-6. For these people, even a minor bacterial trigger becomes a major inflammatory event.

IL-6 variants are common in the population, with roughly 30-40% carrying variants that increase IL-6 production. People with these variants have skin that mounts a disproportionately strong immune response to minor provocations. You might notice that your skin reacts intensely to ingredients that barely bother other people, or that a single blocked pore turns into a painful cyst instead of a small whitehead. Your immune system isn’t calibrated to mild irritation; it’s calibrated to overreaction.

If IL-6 is a driver of your acne, your breakouts are almost always inflamed, tender, and slow to resolve. You might get cystic acne rather than surface breakouts. Your skin might also be sensitive to many skincare products, cosmetics, and fabrics. You might notice that stress dramatically worsens your skin, because stress increases IL-6 production. Healing time after acne clears is often prolonged, with post-inflammatory hyperpigmentation or scarring more likely.