Skin disorders may be clues to the presence of associated microvascular complications of DM.

Clinical presentations of urticaria pigmentosa/maculopapular CM and mastocytoma are similar regarding gender, age of onset, age of diagnosis, and presence of Darier's sign and history of bulla. In contrast to mastocytoma, urticaria pigmentosa/maculopapular CM lesions were frequently located on trunk together with extremities.

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The pathogenesis of seborrheic dermatitis (SD) has not been clearly identified, and many factors are thought to play a role in its development. Recently, new studies have focused on increased oxidative stress (OS) in T cell-mediated skin diseases like psoriasis, contact dermatitis, and atopic dermatitis. However, there is no study investigating the status of OS in SD. In this study, we aimed to determine the status of OS in SD and the correlation of disease severity with OS. Fifty-four patients who were clinically and/or histopathologically diagnosed with SD were included in the study. Fifty-four healthy volunteers constituted the control group. Disease severity in patients with SD was scored according to the Seborrheic Dermatitis Area and Severity Index (SDASI). Serum total antioxidant status (TAS) and total oxidative status (TOS) were measured, and the oxidative stress index (OSI) was calculated in all patients and control subjects. The mean TAS values were significantly lower in the patient group than in the control group (p = 0.024). However, patients had significantly higher TOS and OSI values than the controls (p < 0.05). There was no correlation between SDASI and TAS, TOS, and OSI values. In this study, the association of oxidative stress and disease activity has first investigated in seborrheic dermatitis. It was found that OS was significantly higher in SD patients than in healthy subjects. In conclusion, our findings point to the possible role of the OS for the etiopathogenesis of SD.

A systemic oxidative stress exists in patients with vitiligo. These results indicate that the global antioxidant capacity of patients might have been exhausted through a defence mechanism against oxidative processes. The imbalance in TOS/TAS status may have an important role in the aetiopathogenesis of vitiligo, regardless of the clinical variant of the disease.

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Pseudoallergens and leukotrienes (LTs) may have a role in chronic urticaria (CU). The aim of our study is to evaluate the response to the low pseudoallergen diet therapy in patients with CU and the change in LT levels in diet responsive and non-responsive patients. 34 patients with CU were put on diet for 4 weeks. All patients kept a daily score sheet of pruritus and whealing symptoms. The urticarial activity score (UAS) of each patient was calculated with the sum of pruritus and wheal score. The sum score of the first 7 consecutive days (UAS7-first week) and last 7 days (UAS7-fourth week) were used to compare the clinical outcome of the diet. A reduction of ≥50% in UAS7-fourth week compared to UAS7-first week was considered as "response". Urinary LTE4 (uLTE4) level of each patient was measured at baseline and after the 4 week of diet therapy. 14 of the patients (41.2%) were responsive to diet therapy. Baseline uLTE4 levels were similar between responsive and non-responsive patients (P = 0.540). Second uLTE4 levels (after the 4 week of diet therapy) were significantly lower in responsives than in non-responsive patients (P < 0.001). Second uLTE4 levels of responsives were significantly lower than the baseline values (P = 0.019), whereas this was not significant for non-responsives (P = 0.070). There was a significant correlation between the change in uLTE4 levels and the change in mean urticarial activity scores (r = 0.554, P = 0.001) in the whole study population. In conclusion, low pseudoallergen diet helps to reduce the urticarial activity in CU. The change in urticarial activity correlates with the change in LT levels.

BackgroundRecurrent aphthous stomatitis (RAS) is a chronic relapsing inflammatory disorder of the oral mucosa with unknown etiology. Oxidative stress (OS) is suggested to play a main role in the etiopathogenesis in RAS.ObjectiveIn this study, we hypothesize that a systemic OS is present in patients with RAS.MethodsForty-four patients with active RAS lesions and 38 healthy controls were being included in the study. Serum total oxidant status (TOS), total antioxidant status (TAS), oxidative stress index (OSI), and paraoxonase 1 arylesterase (ARES) activity were being determined.ResultsRAS patients had significantly lower TAS levels and higher TOS and OSI values than controls. The patients had a lower ARES activity when compared to healthy controls. No correlations were observed between OS parameters and age, gender, duration of disease or frequency of RAS attacks per month.ConclusionA systemic OS is determined with an imbalance in oxidant/antioxidant status and lower ARES activity in RAS. Systemic OS may have an important role in the pathogenesis of RAS formation.