Acne, which is a very common skin disease during adolescence, is caused by hormonal changes associated with imbalance in the cutaneous microbiota, to the benefit of a bacteria: Propionibacterium acnes.
About this article
Although they affect the face in 95% of cases, acne lesions can be observed on the back, neck, and the front of the thorax. A quarter of adults are affected, particularly women.
Acne is a disease of the hair follicles, combining the hair with a sebum-producing gland. This cutaneous condition is characterized by various kinds of lesions, depending on the stage: blackheads and whiteheads are the first stage of acne, then papules and pustules correspond to the inflammatory stage.
The role of the cutaneous microbiota
Genetics, hormones, hygiene…. There are many causes of acne but they all have one thing in common: the involvement of the bacteria Propionibacterium acnes in its development. This germ, naturally present on the skin, multiplies under the effect of excess sebum and leads to an imbalance in the cutaneous microbiota. The skin reacts to this local dysbiosis, creating inflammation.
It is now well-known that chronic skin diseases are often associated with other problems. This is the case for acne, where there is a serious prevalence of stress, anxiety, and depression associated with functional gastrointestinal disorders in people affected. The current hypothesis singles out altered interactions in the “gut-brain-skin” axis, which may cause local and systemic dysbioses and inflammation.
A tailor-made treatment
Acne treatment depends on its severity and its psychological impact. Topical and/or oral treatments (antibiotics or isotretinoin) associated with good hygiene generally give good results. However, with the emergence of antibiotic resistance, the search for a safe and effective alternative has become necessary. For several years, probiotics (local or oral) have been studied for therapeutic purposes. Some have notably shown the benefits of lactobacilli (Lactobacillus acidophilus and Lactobacillus paracasei) on the cutaneous barrier, skin sensitivity, hydration, and the functions of the epidermis.
- Bowe W, Patel NB, Logan AC. Acne vulgaris, probiotics and the gut-brain-skin axis: from anecdote to translational medicine. Benef Microbes. 2014;5(2):185-199.
- Wang Y, Kuo S, Shu M, et al. Staphylococcus epidermidis in the human skin microbiome mediates fermentation to inhibit the growth of Propionibacterium acnes: implications of probiotics in acne vulgaris. Appl Microbiol Biotechnol. 2014;98(1):411-424.
- Peguet-Navarro J, Dezutter-Dambuyant C, Buetler T, et al. Supplementation with oral probiotic bacteria protects human cutaneous immune homeostasis after UV exposure-double blind, randomized, placebo controlled clinical trial. Eur J Dermatol 2008 ; 18 : 504-11.
- Gueniche A, Philippe D, Bastien P, et al. Randomised double-blind placebo-controlled study of the effect of Lactobacillus paracasei NCC 2461 on skin reactivity. Benef Microbes 2014 ; 5 : 137-45.
- Philippe D, Blum S, Benyacoub J. Oral Lactobacillus paracasei improves skin barrier function recovery and reduces local skin inflammation. Eur J Dermatol 2011 ; 21 : 279-80.