The plain-language read
Acne-induced hyperpigmentation (AIH) results from increased melanin production and deposition triggered by inflammatory mediators, while acne-induced macular erythema reflects vascular alterations. Both AIH and acne-induced macular erythema can persist for months or even years, significantly contributing to the psychosocial burden of acne and negatively impacting patients' quality of life - sometimes to a greater extent than active acne itself.
- Up to 85% of patients with Fitzpatrick phototypes IV-VI develop post-inflammatory hyperpigmentation following inflammatory acne lesions.
- Acne-induced hyperpigmentation (AIH) results from increased melanin production and deposition triggered by inflammatory mediators, while acne-induced macular erythema reflects vascular alterations.
- Both AIH and acne-induced macular erythema can persist for months or even years, significantly contributing to the psychosocial burden of acne and negatively impacting patients' quality of life - sometimes to a greater extent than active acne itself.
Relevant if you're working with retinol, azelaic acid, tranexamic acid for acne and aging.
What this means for your routine
If you're targeting acne, this research supports adding retinol to your PM routine. Effective concentration range: 85% based on this study.
If you're targeting acne, this research supports adding azelaic_acid to your AM/PM routine. Effective concentration range: 85% based on this study.
Translated from this study's findings, not a personal prescription. Pair with your existing protocol and your practitioner's guidance.
Technical Summary, For Professional Reference
Clinical context
1. Am J Clin Dermatol. 2026 Jul;27(4):697-707. doi: 10.1007/s40257-026-01044-z. Epub 2026 Jun 3. Practical Therapeutic Strategies for Acne-Induced Hyperpigmentation Across all Skin Types.
Full abstract→
1. Am J Clin Dermatol. 2026 Jul;27(4):697-707. doi: 10.1007/s40257-026-01044-z. Epub 2026 Jun 3. Practical Therapeutic Strategies for Acne-Induced Hyperpigmentation Across all Skin Types. Lopez-Estebaranz JL(1), Lopez-Pando M(2), Mitsunaga K(3). Author information: (1)Hospital Universitario Fundación Alcorcon, Calle Budapest 1, 28922, Alcorcón (Comunidad de Madrid), Spain. jlestebaranz@dermomedic.com. (2)Hospital Universitario Central de Asturias, Oviedo, Spain. (3)Hospital Universitario, 12 de Octubre, Madrid, Spain. Post-inflammatory hyperpigmentation and post-inflammatory erythema are common sequelae of acne, particularly affecting individuals with skin of color. Up to 85% of patients with Fitzpatrick phototypes IV-VI develop post-inflammatory hyperpigmentation following inflammatory acne lesions. Acne-induced hyperpigmentation (AIH) results from increased melanin production and deposition triggered by inflammatory mediators, while acne-induced macular erythema reflects vascular alterations. Both AIH and acne-induced macular erythema can persist for months or even years, significantly contributing to the psychosocial burden of acne and negatively impacting patients' quality of life - sometimes to a greater extent than active acne itself. Female individuals, darker skin color, severe acne, facial sites, excessive sunlight exposure, and traumatized lesions are important risk factors for AIH. Diagnosis relies on visual inspection, acne history, and skin phototype assessment. Treatment options include topical agents such as azelaic acid, retinoids, antioxidants, and hydroquinone, as well as systemic therapies such as isotretinoin, oral antibiotics, and oral tranexamic acid. Chemical peeling and energy-based devices, including lasers and microneedling, offer additional therapeutic avenues. Photoprotection is crucial in managing AIH, particularly in skin of color patients. Despite the high prevalence of AIH, there is a lack of validated patient-reported outcome measures specific to AIH/acne-induced macular erythema, highlighting the need for further research and standardized assessment tools. This article provides a practical approach, highlighting therapeutic strategies and recommendations for AIH across all skin types. © 2026. The Author(s), under exclusive licence to Springer Nature Switzerland AG. DOI: 10.1007/s40257-026-01044-z PMID: 42234395 [Indexed for MEDLINE] Conflict of interest statement: Declarations. Funding: No funding was received for the preparation of this article. Conflicts of Interest/Competing Interests: Jose L. Lopez Estebaranz served as a consultant, participated in clinical trials and/or received speaking fees from Almirall, BMS, Janssen, Leo-Pharma, Lilly, AbbVie, Bioderma, Galderma, UCB, Novartis, Pierre-Fabre, Invasix, Isdin, and Incyte. Marta L .Pando has no conflicts of interest that are directly relevant to the content of this article. Keila Mitsunaga received support for travel/meeting participation from Recordati Rare Diseases, Kyowa Kirin, Almirall, Asterasys, Isdin, Cantabria Labs, and Leo Pharma. Ethics Approval: Not applicable. Consent to Participate: Not applicable. Consent for Publication: Not applicable. Availability of Data and Material: Data are available upon request to the corresponding author. Code Availability: Not applicable. Authors’ Contributions: JLLE was responsible for conceptualization, methodology, data acquisition and analysis, and writing, editing, and revising the manuscript. MLP was responsible for methodology, data acquisition and analysis, and writing, editing, and revising the manuscript. KM was responsible for conceptualization, methodology, data acquisition and analysis, and writing, editing, and revising the manuscript.
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