In this study, we aimed to find out how common PCOS is among patients who have acne as their main skin concern. We also looked at the differences in clinical, metabolic, and hormonal profiles between two groups of acne patients: G1, who have both acne and PCOS, and G2, who have acne only.
Acne is a complex condition that involves several interrelated factors:
Excessive sebum production and changes in sebum quality: Sebum is produced in excess and its composition is changed, which weakens the skin barrier and leads to inflammation.
Skin dysbiosis: This is characterized by disruption of the skin's bacterial flora, particularly by Cutibacterium acnes, and plays a significant role in acne development.
Abnormalities in the growth and division of skin cells in the hair follicle: Cutibacterium acnes contributes to the formation of comedones by promoting the excessive production of skin cells, leading to blockage of the hair follicle and buildup of sebum.
Inflammation and activation of the innate immune response play a key role in acne. The pilosebaceous follicle acts as an immune organ where immune cells detect pathogens and release inflammatory cytokines, sustaining the skin's dysbiosis and the inflammation process. [12, 17, 18].
Androgens are known to contribute to the development of acne. Sebocytes and keratinocytes have enzymes that can produce testosterone and dihydrotestosterone (DHT). Enzymes involved in androgenic hormone metabolism, such as 5-alpha reductase, 3-beta-OH steroid dehydrogenase, and 17-OH steroid dehydrogenase, display hyperactivity and abnormal behavior [19]. This results in increased turnover of prohormones like DHEAS, androstenedione, and testosterone, leading to the production of more potent androgenic hormones like testosterone and DHT [20].
Acne is a common skin condition, often affecting women. Its prevalence varies from 12–54% [7]. It usually starts during puberty, impacting up to 85% of teenagers, with the highest occurrence between the ages of 12 and 25 [21]. Acne can persist into adulthood.
Several scales have been developed to classify the severity of acne, such as GEA scale, which was validated in 2011 [16] and used in our study.
Different studies have reported varying prevalence of PCOS in acne patients. For example, Ramezani et al. stated that nearly 43% of acne cases are linked to PCOS [5], while others, such as Kelekci et al., found PCOS to be present in only 17–27% of acne-prone women [22]. Some studies have shown a higher prevalence in patients with severe acne, reaching up to 51% [23]. Timpatanapong et al.'s work revealed that PCOS was identified in 37.3% of acne patients [24].
In our study, we observed an even higher prevalence of PCOS in acne patients, estimated at 65.6%, which is consistent with the findings of other researchers such as Abusailik et al. and Gowri et al. [25, 26].
Only a few studies have compared the characteristics of acne in patients with and without a confirmed diagnosis of PCOS.
Persistent acne was the most commonly observed form, with an estimated prevalence of 53.2% in G1, and no significant difference between the two groups, consistent with the findings of Chanyachailert et al. [8].
In our study, among the 139 G1 patients, 96.4% reported the premenstrual phase as the most common trigger for acne, which is consistent with the findings of Poli et al and Chanyachailert et al [27, 8]. Additionally, our study identified stress as a significant trigger for acne in PCOS patients, with 94.2% prevalence in G1, aligning with the findings of Chanyachailert et al [8]. These results highlight the substantial influence of psychosocial factors on the clinical presentation of acne in the context of PCOS.
Comedone-type acne was observed in 89.1% of G1 in our study, consistent with the findings of Chanyachailert et al [8] and Feng et al [28], where the prevalence of comedonal acne was estimated at 80.6% and 67.7%, respectively, in PCOS patients.
Hirsutism is considered to be the earliest cutaneous manifestation of PCOS [29]
In our research, we found that hirsutism was prevalent in 94.2% of G1 compared to 67.1% in G2 (p < 10− 3). These results support the findings of previous studies by Williamson et al [30], Chang et al [31], Legro et al [32], and Diamanti-Kandarakis et al [33], who also reported similar hirsutism prevalences. However, other studies, like the one by Chanyachailert et al [8] with 208 patients, found lower prevalences, with only 11.5% of patients being hirsute.
Androgenic alopecia is less common and occurs later in PCOS, but it has significant psychological effects [15]. Studies by Hacivelioglu et al [34], Özdemir et al [35], and Keen et al [36] revealed alopecia prevalences similar to our study, ranging from 31–41.3%. However, a study by Feng et al [28] reported a lower prevalence of alopecia (23.1%) in PCOS patients with acne, which aligns with the results of Schmidt et al [37], where the alopecia rate was 22.4%. In our study, androgenic alopecia was estimated at 37.4% for G1, significantly higher than for G2, where it was 21.9% (p < 10− 3).
There is a strong connection between PCOS and obesity, and it is unclear whether one causes the other. The prevalence of this link is now very high, affecting up to 50% of women with PCOS [38]. In our study, we looked at the obesity history and weight of our patients. We found that the weight of women with acne and PCOS was significantly higher compared to healthy women (p = 0.02), which is consistent with existing data [39].
The average BMI of women with PCOS and acne in our study was 29.58 ± 7.44 for the first group (G1), significantly higher than the 26.07 ± 5.54 for the second group (G2) (p < 10− 3). This average was notably higher than those reported in other studies, such as 21.14 ± 2.98 in a study by Kim et al [40], 25.5 ± 5.4 in a study by Hacivelioglu et al [34], and 24.6 ± 5.3 in a study by Franik et al [41].
Most women with PCOS and acne were either obese or overweight. The incidence of obesity was significantly higher in G1, at 44.6% compared to 18.1% in G2 (p < 10− 3). These findings align with the results from studies by Sas et al [42], Franik et al [41], Alan et al [43], and Chanyachailert et al [8].
In our study, we found that the average level of testosterone was 0.72 ± 0.27 ng/mL for G1, which was significantly higher than the level for G2, which was 0.43 ± 0.15 ng/mL (p < 10− 3). High testosterone levels were present in 81.3% of G1 patients, which was significantly higher than the 34% prevalence found by Hacivelioglu et al [34].
Similarly, other studies have also shown a similar trend. Studies of acne-prone PCOS patients by HAHN et al [44], Ozdemir et al [45], and Xu et al [46] reported significant high testosterone levels, with levels of 0.78 ng/ml ± 0.29, 0.73 ng/ml [0.51–0.91], and 0.75 ng/ml ± 0.23, respectively.
Acne and obesity are frequently linked with PCOS. Research has shown that BMI is positively associated with the severity of acne in teenage girls and young adults [42]. Previous studies, such as those conducted by Alan et al [43], Franik et al [41], and Di Landro et al [47], have also demonstrated this connection. A study by Sas et al [42] suggests that higher BMI in teenage girls is linked to a greater risk of severe acne compared to those with a normal weight. Higher BMI values were also connected to a higher prevalence of acne with inflammatory lesions, while non-inflammatory lesions were more frequently observed in individuals with a lower BMI [42]. A high BMI can lead to increased secretion of Insulin Growth Factor (IGF1), which stimulates keratinocyte proliferation, sebaceous lipogenesis, and androgen synthesis. All of these processes can contribute to the development of acne in predisposed individuals [48, 49].
Our study did not find a link between acne severity and higher BMI, which supports the findings of Lu et al. They reported no association between acne severity in Taiwanese women aged 25–45 years and higher mean BMI [50]. The absence of this association could be attributed to the use of a different acne scoring system in this study and the exclusion of acne patients with PCOS. Additionally, Snast et al [51] and Tsan et al [52] concluded that obesity might actually protect against acne, possibly due to increased aromatase activity and the peripheral conversion of androgens to estrogens in excess adipose tissue.
The role of hyperprolactinemia in the development and worsening of acne is not well understood. Some studies have suggested that elevated PRL levels can lead to increased production of DHEAS by the adrenal glands, which may contribute to the development of acne [53]. Our study did show a positive association between hyperprolactinemia and severe acne. However, there are only a limited number of studies exploring this relationship, with some, such as those by Bansal et al [54] and Meena et al [53], failing to find an association between hyperprolactinemia and severe acne.