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( Seokyoung Kang ),( Jincheol Kim ),( Minje Jung ),( Boyoung Chung ),( Chunwook Park ),( Hyeone Kim ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: The patients with facial contact dermatitis by wearing a disposable mask were rapidly increased due to the outbreak of COVID-19 Objectives: The aim of this study was to investigate the clinical manifestation and results of allergy patch test for the patients with facial contact dermatitis induced by disposable mask. Methods: The clinical manifestations, and patch-test (T.R.U.E. TEST®) results of 26 patients with contact dermatitis induced by the disposable mask (mask group) and 70 patients by other cause (control group) are investigated as a control group. Results: The skin lesion was more common in centrofacial area (69.23%) than peripheral area (30.76%). Hyperkeratosis (23.07%) and xerosis (11.53%) were more frequent in mask group. Patients in mask group complained mostly itching (57.69%) and flushing (23.07%). Patients in mask group show more positive reaction of Potassium dichromate (26.92%, [mask group] vs 10.00%, [control group]) and 4-tert-butylphenol-formaldehyde resin (15.38%, [mask group] vs 2.85%, [control group]) than control group in patch-test results. Eleven patients in control group (15.71%) were negative reaction of all items in patch-test result, in contrast only one patient showed negative reaction in mask group (3.84%). The patients of mask group showed clinical improvement after changing to cloth mask Conclusion: Patients with the facial contact dermatitis induced by disposable mask presented different contact sensitization profiles compared to control group
The clinical characteristics and courses of pityriasis rosea in Korea
( Jincheol Kim ),( Seokyoung Kang ),( Minje Jung ),( Boyoung Chung ),( Chunwook Park ),( Hyeone Kim ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Pityriasis rosea is an idiopathic acute or subacute inflammatory disease with diverse subtypes and clinical courses. Objectives: The aim of this study was to investigate the clinical characteristics and courses of Korean pityriasis rosea patients. Methods: The demographic features, medical history, clinical characteristics, laboratory finding and treatment modalities of 80 pityriasis rosea patients are investigated. Results: The mean age of patients was 31.8 and 63.8% (51/80) of patients were female. The secondary lesion occurs 9.7 days after the primary lesion and lasts for 49.6 days on average. The primary lesions mainly occurred on the abdomen (18.8%, [15/80]) and 46.3% (37/80) of patients did not recognize the primary lesions. The secondary lesions mostly occur on the chest (77.5%, [62/80]) and abdomen (86.3%, [69/80]) with Christmas tree pattern (93.8%, [75/80]). 21 patients (26.3%) accompanied by prodromes and 52 patients (65.0%) accompanied by pruritus which is lower than expected. Most patients were treated by antihistamine (97.5%, [78/80]), topical calcineurin inhibitor (87.5%, [70/80]) and ultraviolet therapy (87.5%, [70/80]). Conclusion: Pityriasis rosea mainly occurred on the abdomen and lasted for about 7 weeks in Koreans. The treatment duration was longer in men, non-macular subtype regardless of age, primary lesion, prodromes,and itching severity. This study provides information about the clinical course of pityriasis rosea in Korean.
Effect of transient receptor potential vanilloid-3 (TRPV3) activator and inhibitor to itching
( Jincheol Kim ),( Seokyoung Kang ),( Minje Jung ),( Boyoung Chung ),( Chunwook Park ),( Hyeone Kim ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Transient receptor potential vanilloid 3 (TRPV3) is a non-selective cation channel, which is a member of the TRP family. It is expressed in skin involving in the thermoception, nociception, and itching Objectives: We aimed to determine whether TRPV3 activator (Carvacrol) and inhibitor (Forsythoside B) affect itching Methods: In study A, different concentrations of Carvacrol (50%, and 100%) were applied along with vehicle control (ethanol 10%) and other pruritogens (Histamine 1%, and β -alanine 50%). During 10 minutes after application, we checked the numerical rating scale (NRS) for itching every 1 minute. Study B was done in two stages. After the application of different concentrations of Forsythoside B (50% and 100%) and topical antihistamine for 30 min, pruritogens were applied on the same region Results: Twenty participants completed the clinical trials in this study. In study A, Carvacrol induced itching at any concentration without erythema or wheal. Higher concentrations of carvacrol caused more severe itching. In study B, there was a decrease in NRS score depending on the concentration of Forsythoside B. There was a dose-response relationship between the reduction in itching and the concentration of carvacrol, not in other triggers Conclusion: The activation of the TRPV3 channels by Carvacrol induces itching and Forsythoside B reduces itching as TRPV3 inhibitor. Carvacrol, the natural TRPV3 activator, is a non-histaminergic pruritogen in human as well as the mouse model.
The clinical courses and prognosis of scabies mite
( Jincheol Kim ),( Seokyoung Kang ),( Minje Jung ),( Boyoung Chung ),( Chunwook Park ),( Hyeone Kim ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: The scabies mite is a common parasite that burrows in the skin and causes an allergic reaction resulting in severe pruritus. Objectives: This study aimed to investigate the clinical courses and prognosis of Korean scabies patients. Methods: The demographic features, clinical manifestations, and treatment modalities of 383 patients infected with scabies are investigated retrospectively. Total IgE and multiple antigen simultaneous test results of 64 patients are also investigated. Results: The mean duration of pruritus was 25.2 days after treatment. Compared to the scabicide plus antihistamine treatment, there was no difference of the duration in the scabicide plus antihistamine and methylprednisolone treatment. In 318 patients, lasting pruritus over 2 weeks, patients who have applied scabicide multiple times (2-3 times per week) show better prognosis (18.22 ± 8.39 days vs 39.28 days ± 17.57 days) compared to less applied patients (0.17 - 0.5 times per week). Between patients taking medication for more than 2 weeks and the patients taking medicine for less than 2 weeks for itching, the total IgE concentration and proportion of patients sensitized to dermatophagoides farinae (D2) were higher in the former. There was no significant difference in oral steroid use, kinds of scabicides, age, and sex between two groups. Conclusion: This study shows that dermatologists should advise the patients that the eruption and pruritus take some time to resolve and enough use of scabicide is needed.