Diagnosis can be difficult in isolated palmar and plantar lesions in patients with psoriasis and eczema. The purpose of our study is to compare the dermoscopic findings in patients with palmoplantar psoriasis and palmoplantar hyperkeratotic eczema. This prospective, comparative study included 90 patients histopathologically diagnosed with eczema or psoriasis (35 psoriasis and 55 eczema). The age range was 18-75 years. The most common vessel type was dot vessel in psoriasis. Red globular ring vessels were seen in five patients with psoriasis, but not in any with eczema (P = 0.007). The most common vascular distribution pattern was regular in psoriasis (40%). Patchy vascular pattern was significant in eczema. The most common background color was light red in psoriasis (48.6%) (P < 0.001). Brownish-orange globules were observed in 25.7% of patients with eczema and 5.7% in patients with psoriasis (P = 0.02). There is only one study in the published work about dermoscopy of palmoplantar psoriasis and eczema. In our study, yellow crusts, patchy scale distribution, patchy vascular pattern, yellow scale color, dull red background color and brownish-orange globules were significant in patients with palmoplantar eczema. On the other hand, patients with psoriasis had light red background color, regular vascular distribution pattern and white scale color. We observed globule structures with a pale center and dark peripheral rim only in patients with eczema, which was not identified in previous studies. This globule structure may be a new finding in eczema.

Hidradenitis suppurativa (HS) is a chronic, recurrent, and debilitating skin disease.Recent studies showed that inflammatory biomarkers, such as neutrophil-lymphocyte ratio (NLR), platelet-lymphocyte ratio (PLR), Lymphocyte/HDL ratio (LHR), Neutrophil/HDL ratio (NHR), and Monocyte/HDL ratio (MHR) are an indicator of inflammatory diseases and may be associated with disease severity and disease activity. To investigate NLR, PLR, LHR, NHR, and MHR in HS patients. In addition, to compare erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), complete blood count, leukocyte profile, and biochemical parameters between the control and the patient group. Clinical and biochemical data of patients and healthy subjects were collected from medical records, retrospectively. In total, 166 patients with HS and 124 control subjects were included. We found no significant difference in NLR (P = .207) and PLR (P = .257). LHR (P < .001), NHR (P < .001), and MHR (P < .001) were significantly higher in the patient group. No positive correlation was found between any of these markers and disease severity according to Hurley staging system. However, MCV (Mean corpuscular volume), RDW (Red cell distribution width), and CRP showed a significant positive correlation with disease severity. Among these markers, only MHR was positively correlated with disease duration. Our study shows that CRP still maintains its value for HS patients compared to new inflammation markers. Unlike the studies in other inflammatory diseases, no significant relationship was found with most of these inflammatory parameters. MHR may be more useful in patients with HS as an indicator of inflammation compared to other parameters.

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Tuberculin skin test (TST), which is used in the diagnosis of latent tuberculosis infection, may cause Koebner's phenomenon and false‐positive results in psoriasis patients. The purpose of this study is to compare TST with QuantiFERON‐TB Gold Plus (QFT‐plus) test in psoriasis patients and to determine the effects of psoriasis on TST results. Ninety‐two psoriasis patients and 30 control subjects were included in the study. QFT‐plus test, TST, and prick test to distinguish the increase of induration because of the skin trauma were performed on both groups. The demographics, risk factors for latent tuberculosis infection, BCG vaccination history, Koebner's history, psoriasis severity, and treatment history of the patients were recorded. The effects of these variables on test results were investigated by comparing those with control group. The criteria of National Tuberculosis Diagnosis and Treatment Guidelines were used in the evaluation of test results, and threshold value of positivity for TST was taken as 10 mm in BCG‐vaccinated patients who are planned to start biological treatment. Prick test results were negative in the control group. There was no significant relation between the results of prick test and TST induration diameters in the patient group. Although TST positivity was significantly higher in patients (62%) compared with control group (33%), QFT‐plus test results were not statistically different between two groups. Agreement between two tests was determined to be low in patient group with 48% (K = 0.1), and it was determined to be moderate with 77% in control group (K = 0.4). QFT‐plus test was found to be negative in 46 of 57 TST‐positive patients (80.7%) in patient group. It was determined in both groups that vaccination did not have any effect on test results. When threshold value was lowered to 5 mm in patient group without considering BCG reaction, the number of TST‐positive patients increased from 57 to 65. Mean TST induration diameter was 10 mm and 14 mm in cases with mild and moderate to severe clinical manifestation, respectively (P = .04). However, no effect of disease period and treatment was determined on both test results. TST positivity was higher in psoriasis patients compared with control group. It was considered due to the increased reaction of the skin to mycobacterial antigens rather than the Koebner's response. Although TST results were not affected by BCG, it was concluded that a 10‐mm threshold value of positivity was a suitable approach in order to reduce the number of patients receiving unnecessary preventive treatment in patients who are considered to initiate biologic agents. Furthermore, it was also concluded that QFT‐plus test may be preferred in psoriasis patients since it is applied in vitro and its specificity is higher and not affected by disease severity.

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