Why am I breaking out as an adult, is it hormonal acne?

What makes acne hormonal rather than something else

Not all adult acne is hormonal, but several features make it more likely that the underlying driver is hormonal rather than purely bacterial, environmental, or cosmetic.

Location is the most reliable indicator. Hormonal acne characteristically clusters along the jawline, chin, and lower cheeks, and sometimes the neck. This distribution reflects the higher density of androgen receptors in the sebaceous glands of the lower face relative to the upper face and forehead. Acne that is predominantly in this zone, even if other areas are also occasionally affected, strongly suggests an androgen-driven sebum component.

Timing is the second indicator. Breakouts that consistently worsen in the week before menstruation, correspond with periods of elevated work stress, or appeared or intensified when occupational demands increased, are following a hormonal pattern rather than a random one. This cyclical or stress-correlated timing reflects the underlying androgen and cortisol fluctuations rather than a change in skincare routine or environmental exposure.

Quality matters too. Hormonal acne tends to be deeper and more cystic than the surface-level comedones associated with pore-clogging cosmetics or simple bacterial overgrowth. The deep, often painful nodules that form along the jawline are characteristic of androgen-driven sebaceous gland overactivity, where the sebum production is occurring deep in the follicle rather than at the surface.

If your acne matches these three features, location, timing, and quality, the hormonal pathway is very likely the primary driver, and addressing it at that level will produce more durable results than surface treatments alone.

The androgen and cortisol pathway

The primary hormonal driver of acne is androgen activity in the sebaceous glands, specifically the stimulation of sebum production by testosterone and its more potent metabolite dihydrotestosterone (DHT).

Sebum is a necessary skin lubricant. In normal amounts, it maintains skin barrier function and prevents excessive dryness. When androgen stimulation is high, sebum production increases beyond what the skin needs, blocking follicles and creating the anaerobic environment in which acne-causing bacteria proliferate.

Cortisol elevation from chronic stress contributes to this pathway through two mechanisms. First, the adrenal glands produce androgens (primarily DHEA and DHEA-S) alongside cortisol, and sustained HPA axis activation increases adrenal androgen output. This raises the androgenic stimulus to sebaceous glands even when ovarian or testicular androgen production is within the normal range. Second, cortisol directly stimulates sebaceous gland activity through cortisol receptors in the skin, independent of the androgen pathway, which is why stress-correlated breakouts can occur even when androgen levels appear normal on testing.

For crew, this mechanism explains the pattern many notice but rarely connect: skin that deteriorates during demanding charter seasons and recovers somewhat during genuine breaks, not because stress is bad for skin in a vague, unspecified way, but because cortisol and adrenal androgens are directly stimulating sebum overproduction through measurable, specific pathways.

The insulin-IGF-1 connection

A second major driver of hormonal acne that is directly relevant to the on-board environment is the insulin-IGF-1 pathway.

Insulin-like growth factor 1 (IGF-1) is a growth-promoting hormone that amplifies androgen activity in sebaceous glands, increases keratinocyte proliferation (the cell shedding process that blocks pores), and directly stimulates sebum production. IGF-1 levels are elevated by insulin, which means that anything raising insulin, including high-glycaemic eating, cortisol-driven insulin resistance, and frequent carbohydrate-heavy meals, also elevates IGF-1 and compounds the androgenic stimulus to the skin.

In the on-board environment, the dietary factors that raise insulin most significantly are often the hardest to control: chef-prepared menus that tend toward refined carbohydrates, sweet desserts, bread, pasta, and rice as staples, and irregular eating patterns that produce the blood sugar spikes associated with higher insulin output. Crew have limited control over what is served, which is not a reason to catastrophise but is a genuine contributing factor to the skin picture.

Dairy products add a specific dimension to this pathway. Dairy, particularly cow's milk, contains IGF-1 precursors and bovine hormones that activate similar receptors to human IGF-1 and androgens in the sebaceous glands. Independent of any direct hormonal content, the protein fractions in milk (particularly whey and casein) stimulate insulin secretion, compounding the insulin-IGF-1-androgen pathway. The connection between dairy consumption and acne is one of the more consistently supported dietary associations in the dermatological literature, and dairy reactivity or sensitivity is among the most relevant dietary factors to investigate when acne is a persistent concern.

The gut-skin axis

The connection between gut health and skin health is well-established but often underappreciated in the context of adult acne. The gut-skin axis operates through several mechanisms that are directly relevant to the yachting population.

Increased intestinal permeability (often called leaky gut) allows lipopolysaccharides (LPS) and other bacterial compounds to pass from the gut into circulation. These compounds trigger systemic inflammation that can express at the skin surface as acne, redness, and barrier disruption. Gut dysbiosis, the imbalance of the gut microbiome associated with chronic stress, irregular eating, and antibiotic use, is associated with both increased intestinal permeability and the skin inflammation that follows from it.

Impaired estrogen clearance through the gut is also relevant to skin specifically in women. When the estrobolome is compromised and estrogen recirculates rather than being eliminated, the resulting relative estrogen excess and low progesterone pattern affects the skin through the sebaceous glands and inflammatory pathways, contributing to acne alongside the androgen and insulin-IGF-1 drivers.

For crew with persistent adult acne that does not respond fully to dietary changes or topical treatments, gut health assessment is often the missing piece, because the skin is expressing a systemic inflammatory and hormonal picture that has gut function as one of its underlying contributors.

Why topical treatments don't resolve hormonal acne

Topical treatments (retinoids, benzoyl peroxide, salicylic acid, antibiotics) address the surface expression of acne: the bacterial environment, the blocked pores, the inflammatory response at the skin. They are not without value, and some topical approaches significantly reduce the visible severity of breakouts while the underlying cause is being addressed.

The reason topical treatments do not resolve hormonal acne is that they cannot reach the hormonal and inflammatory drivers operating upstream. The sebaceous gland overactivity driven by androgens and IGF-1 continues regardless of what is applied to the skin surface. The gut dysbiosis contributing to systemic inflammation and impaired estrogen clearance is unaffected by topical application. The cortisol-driven adrenal androgen production is not reduced by any skin product.

This is why the characteristic experience with topical treatments for hormonal acne is partial, temporary improvement: the surface symptoms are managed while the underlying cause continues, and the pattern returns when treatment stops or becomes less effective over time. Addressing the hormonal and inflammatory drivers that are generating the excess sebum and inflammation, rather than only managing the skin surface where that excess is expressing, is what produces durable improvement rather than ongoing symptom management.