Objective: Telogen effluvium is one of the chronic diseases that affect the quality of life (QoL) in women. The study aimed to evaluate the RDW/MCV ratio and its correlation with ferritin in Telogen Effluvium patients and to reveal their potential role in the etiopathogenesis of Telogen effluvium. Material and Methods: We retrospectively evaluated the medical data of 250 patients who were admitted to the dermatology outpatient clinic between September 2020 and December 2020 with a diagnosis of Telogen effluvium. The control group was created retrospectively from the medical records of 250 healthy individuals. HB, HCT, MPV, MCV, RDW, ferritin, and MCV/RDW ratio of both groups were compared and evaluated statistically. Results: All of the Telogen effluvium patients were women in terms of gender. The mean age of the patient group was 33,11±9,66 years and the mean age of the control group was 34,98±12,37 years. The ratio of MCV/RDW, MPV, MCV, and ferritin is lower in the group with Telogen effluvium compared to the control group and a statistically significant difference was found(p<0.05). However, the correlation between MCV/RDW ratio and ferritin was evaluated in Telogen effluvium patients, and no significant differences were found (p>0.05). Conclusion: Iron deficiency anemia is thought of as a factor in female patients with telogen effluvium. Although the data shows the correction of iron deficiency is insufficient telogen effluvium, we proposed that laboratory tests should be routinely used in the diagnosis and treatment phase of patients who apply with the complaint of hair loss.

Objective Vitiligo is a common dermatological disease of unknown cause and progressing with depigmentation and affects approximately 1% of the world population. In the study, we aimed to compare plateletcrit (PCT), mean platelet volume (MPV), platelet (PLT), and thyroid‐stimulating hormone (TSH) values in vitiligo patients. Material and Methods We retrospectively evaluated the medical data of 100 patients who were admitted to the dermatology outpatient clinic between January 2020 and December 2021 with a diagnosis of vitiligo. The control group was retrospectively constituted from medical records of 90 healthy individuals. PCT, MPV, PLT, and TSH levels of both groups were compared statistically. Results A total of 190 participants (100 vitiligo patients and 90 healthy volunteers) were included in the study. The mean age of the patient group was 38.62 ± 1.62, while the mean age of the control group was 41.52 ± 1.54. There were no differences between the two groups in terms of age and gender. It was found that the mean MPV value in the patient group was lower than the control group (p = 0.00). PLT and PCT values were significantly higher in the patient group than the control group (p = 0.00, p = 0.01, respectively). There was no statistically significant difference between the two groups in terms of TSH (p > 0.05). A negative correlation between MPV and PLT values in the patient group (r = −0.218, p = 0.029), and a negative correlation between MPV and TSH (r = −0.218, p = 0.029), (−0.230, p = 0.021). Conclusion In the study, a comparison of the PCT, MPV, and PLT levels showed a difference between both groups, but no differences in TSH levels. To clarify these results, comprehensive studies with more samples are needed.