Acne Vulgaris

Acne vulgaris is the most common chronic inflammatory disease of the pilosebaceous unit. At the molecular level, it results from a complex interplay of four core drivers: (1) excess sebum production driven by androgens; (2) abnormal keratinization of the follicular opening (infundibular hyperkeratinization), forming microcomedones; (3) an imbalance and shift in the strains of Cutibacterium acnes (formerly Propionibacterium acnes); and (4) a cascade of innate and adaptive immune inflammation that begins before any lesion is visible.

We now understand that acne is not simply a matter of mechanical blockage. Changes in the lipid make-up of sebum (sebum dysbiosis), especially a drop in linoleic acid (<15%) together with increased oxidation of squalene to squalene monohydroperoxide, act as the trigger. This oxygen-poor, lipid-rich environment selectively favors highly virulent C. acnes strains (such as phylotype IA1) and releases chemotactic signals that prompt epidermal keratinocytes to release interleukin-1 alpha (IL-1α). IL-1α acts as a master cytokine, driving the proliferation and stickiness of keratinocytes in the follicle neck and forming a keratin plug. Next, extracellular vesicles from C. acnes activate the pattern-recognition receptors TLR-2 and TLR-4 on keratinocytes and macrophages, switching on NF-κB signaling and the NLRP3 inflammasome. This unleashes potent pro-inflammatory cytokines such as IL-1β, IL-18 and TNF-α, turning a silent microcomedone into visible inflammatory lesions: papules, pustules, nodules and cysts.

At Haute-Derma, we view acne as "a disturbed ecosystem with micro-inflammation inside the hair follicle." We steer clear of heavy-handed approaches that damage the skin barrier, such as aggressive extractions or repeated deep peels. Our philosophy centers on "restoring biological balance (microbiome and sebum rebalancing) combined with targeted immune modulation." By re-establishing the skin's native microbiome, controlling sebum oxidation and using fractional photomechanical light technologies, we tackle inflammation at its source while substantially lowering the risk of atrophic scarring and post-inflammatory marks (PIH/PIE).

Our Approach to Acne at Haute-Derma

Because acne has many causes and tends to relapse, Haute-Derma follows a treatment framework built on strict clinical principles:

Screening for systemic hormonal causes: This is especially important in adult women with acne. A hormone work-up (free testosterone, DHEA-S, LH, FSH) and ovarian ultrasound are required to rule out polycystic ovary syndrome (PCOS) before a treatment plan is set.
Protecting the epidermal lipid barrier: All high-strength acne actives (retinoids, BHA, benzoyl peroxide) are delivered in a highly biocompatible buffered base to prevent transepidermal water loss (TEWL) and secondary irritation.
Heading off fibrosis and vessel dilation early: Light-based technologies that target blood vessels and collagen are used while acne is still active, to reduce the risk of post-inflammatory erythema (PIE) and atrophic scars.

Screening and Clinical Risk Stratification at Haute-Derma

To confirm the diagnosis and grade acne accurately, Haute-Derma uses a multi-step diagnostic process:

Examining follicles with dermoscopy: Using high-resolution dermoscopy, the doctor assesses how densely the follicle openings are blocked, looks for net-like or dotted vessels around inflamed papules (a sign of active new vessel growth), and indirectly gauges how thick the surface keratin is.
Wood's lamp fluorescence for C. acnes: Under 365 nm Wood's light, skin heavily colonized by C. acnes glows a bright coral-red, because the bacterium produces coproporphyrin III. The intensity of the glow gives the doctor an indirect measure of bacterial load and shows how well antibacterial treatment is working at each stage.
Sebum analysis by sebumetry: Precise measurement of surface sebum output (µg/cm²) shows how enlarged the sebaceous glands are, so oral sebum-regulating medication (such as isotretinoin) can be dosed individually.

Clinical Management and Aesthetic Treatments at Haute-Derma

Our treatment strategy aims to calm inflammation, clear blocked follicles and restore a healthy microbial balance:

Gold Toning Nd:YAG (585–595 nm / 1064 nm): A very short-pulse laser with a dual target. The 585 nm wavelength is strongly absorbed by hemoglobin in the tiny vessels feeding inflamed papules, shrinking them and quickly reducing redness and swelling. At the same time, the 1064 nm wavelength in microsecond mode gently heats the sebaceous glands, reducing their size and oil output without burning the skin surface.
Photodynamic therapy (PDT) with 5-aminolevulinic acid (5-ALA): Reserved for severe nodulocystic acne that has not responded to oral medication. A low-strength (5–10%) 5-ALA photosensitizer is applied and builds up selectively in overactive, enlarged sebaceous glands. Narrow-band red light (633 nm) then triggers a photodynamic reaction that generates singlet oxygen, selectively destroying sebaceous cells and anaerobic C. acnes. This helps deep lesions resolve quickly and gives a lasting reduction in pore size.
Liposomal salicylic acid resurfacing: A proprietary formula of salicylic acid 20–30% encapsulated in skin-compatible lipid vesicles (liposomes). The oil-soluble acid passes easily through the sebum-keratin plug into the follicle to loosen sticky keratinocytes, while keeping water loss from the protective lipid layer to a minimum. This greatly reduces flaking, redness and stinging after the peel.
Topical home-care protocol targeting genes and microbiome:
- Trifarotene 0.005% (fourth-generation retinoid): Highly selective for RAR-γ, the dominant retinoic acid receptor in skin. It normalizes keratinization in the follicle neck with very little irritation.
- Micronized benzoyl peroxide suspension: Releases active oxygen deep in the follicle to kill C. acnes without driving antibiotic resistance. It is encapsulated to lower the risk of irritant contact dermatitis.
- Antimicrobial peptide complex (oligopeptide-10) with niacinamide 5%: Dampens inflammatory signals from TLR-2 while protecting the skin's beneficial microbes.

Acne Vulgaris: Frequently Asked Questions

+Why does a shift in Cutibacterium acnes phylotypes, rather than the number of bacteria, determine whether skin develops severe inflammatory acne?

This has transformed our understanding of acne. The old view was that acne came from having too many C. acnes. Modern gene-sequencing studies, however, show that people with healthy skin and people with severe acne carry similar amounts of C. acnes. The key difference is an imbalance between phylotypes. C. acnes falls into several main subgroups, including IA1, IA2, IB, II and III. In severe inflammatory acne, the microbiome loses diversity and becomes clearly dominated by phylotype IA1 (particularly clonal complex CC18). IA1 strains are highly virulent: they secrete large amounts of lipase and protease that break sebum down into irritating free fatty acids, and they form a dense biofilm that anchors them to the follicle wall and shields them from antibiotics. Phylotypes II and III, by contrast, are harmless and act as protective commensals. So at Haute-Derma, the aim is not to wipe out all bacteria indiscriminately but to suppress phylotype IA1 while supporting the friendly phylotypes.

+What molecular mechanism lets low cumulative-dose isotretinoin (0.1–0.2 mg/kg/day) control acne long term without wrecking the skin barrier?

Isotretinoin (13-cis-retinoic acid) is the only drug that acts on all four drivers of acne. At the molecular level it enters the nucleus of sebaceous cells (sebocytes), binds RXR/RAR receptors and triggers signaling that increases expression of FoxO1 (Forkhead box O1). FoxO1 is a natural brake on mTORC1, the hub that drives lipid synthesis and cell growth. At traditional high doses (0.5–1.0 mg/kg/day), isotretinoin causes widespread apoptosis (programmed death) of sebocytes, and the collapse of the lipid barrier leads to dry skin, nail fragility, raised liver enzymes and severe dryness of the conjunctiva. At Haute-Derma we use a prolonged low cumulative-dose isotretinoin protocol. Rather than destroying sebocytes outright, it keeps FoxO1 just high enough to shrink the glands, cut sebum output by roughly 50–60%, normalize keratinization in the follicle neck and preserve a minimum of physiological lipid to protect the barrier. Patients get lasting clearance without having to endure serious toxic side effects.

+How can post-inflammatory erythema (PIE) and post-inflammatory hyperpigmentation (PIH) be told apart clinically and microscopically to choose the right laser wavelength?

Both are flat discolored marks left after inflamed acne settles, but they call for completely different light-based approaches:

Post-inflammatory erythema (PIE):
- Underlying biology: Chronic dilation of, or damage to, small blood vessels during follicular inflammation.
- Clinical signs: Pink, red or purplish-red marks. Pressing with a finger or a glass slide (diascopy) makes them blanch temporarily as blood is pushed out of the vessels.
- Laser choice: The target is hemoglobin, so wavelengths strongly absorbed by red blood cells are needed, such as 585 nm (Gold Toning) or long-pulsed Nd:YAG 1064 nm, which coagulate dilated vessels without harming skin pigment.
Post-inflammatory hyperpigmentation (PIH):
- Underlying biology: Inflammatory cytokines stimulate melanocytes to make more melanin and pass melanosomes into surrounding keratinocytes (or drop pigment into the dermis).
- Clinical signs: Light brown, dark brown or gray-black marks. Their color does not change at all under glass pressure.
- Laser choice: The target is melanin, so a picosecond laser (755 nm or 1064 nm) is used. Its photomechanical pulses shatter epidermal and dermal pigment into fine particles that macrophages then clear.

+Why can squeezing inflamed acne (papules/pustules) directly cause deep icepick scars?

In an inflamed papule, the follicle wall is already thinned and under great pressure from infiltrating neutrophils and macrophages and from pus rich in tissue-digesting enzymes, notably matrix metalloproteinases (MMPs), especially MMP-1, MMP-8 and MMP-9. These enzymes clear dead tissue but also break down the healthy type I and III collagen and elastin that support the follicle. Squeezing from the outside creates intense compressive force. Rather than pushing pus out, it often tears or ruptures the follicle wall completely into the deep dermis. Pus laden with C. acnes, keratin and MMPs then floods the dermis and sets off widespread destructive inflammation. Healing that follows is badly short of collagen; the supporting tissue collapses and pulls the epidermis down toward the deep dermis, leaving permanent icepick or boxcar scars that are very hard to correct.

Acne Vulgaris

Our Approach to Acne at Haute-Derma

Screening and Clinical Risk Stratification at Haute-Derma

Clinical Management and Aesthetic Treatments at Haute-Derma

Acne Vulgaris: Frequently Asked Questions

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