Modulation of skin microbiome in acne patients by aminolevulinic acid-photodynamic therapy
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Updated: Oct 18, 2025

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Published on: April 16, 2018
Yin Yang1, Shiqin Tao2, Rong Zeng1
1Department of Cosmetic Laser Surgery, Hospital for Skin Disease and Institute of Dermatology, Peking Union Medical College & Chinese Academy of Medical Sciences (CAMS), Nanjing 210042, China.
Background:
Aminolevulinic acid-photodynamic therapy (ALA-PDT) has been an effective treatment for moderate to severe acne. However, the effect of ALA-PDT on skin microbiome in acne patients should also be examined..
Aim:
To examine the composition, diversity, and resilience of skin microbiome in acne patients before and after ALA-PDT.
Method:
A prospective study was conducted on five patients with moderate to severe acne. All patients underwent a 5% ALA-PDT at a two-week interval for four sessions. Epidermal and follicular samples of acne patients were acquired for 16S rRNA gene amplicon metasequencing at baseline and before the final session.
Result:
ALA-PDT inhibited Cutibacterium acnes of follicular microbiome in acne. Follicular residential bacteria, mainly Bacillus and Lactococcus, rose in abundance after PDT. ALA-PDT increased the diversity of skin microbiome in acne and clustered follicular microbiome toward epidermal microbiome, both taxonomically and functionally.
Conclusion:
ALA-PDT exerts its therapeutic effect on acne partially through inhibiting C. acnes and modulating the composition and potential function of skin microbiome in acne.
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