Youn, Sang Woong

BACKGROUND/AIM: Aging of skin is accompanied by decrease of skin elasticity. Using the noninvasive suction device Cutometer, we evaluated the age and regional body differences of the viscoelastic properties of human skin. The objectives of this study were to evaluate the correlation between age and the biomechanical parameters and the regional skin variations. METHODS: A total of 96 healthy women aged 20-75 years were included in this study. The biomechanical properties of the skin were measured

BACKGROUND: Various skin parameters including skin visco-elasticity and hydration level affect the formation of wrinkles. OBJECTIVE: The aim of this study was to investigate the comprehensive and objective relationship between age, skin visco-elasticity, hydration level, and the occurrence of wrinkles using bioengineering equipments for the first time. METHODS: A total number of 97 healthy women were included in this study. Age, Fitzpatrick skin type, skin mechanical parameters obtained with Cut

BACKGROUND/AIMS: Facial sebum secretions are known to change under various circumstances. Facial skin types have been categorized as oily, normal, dry, and combination types. However, these have been evaluated subjectively by individuals to date, and no objective accepted standard measurement method exists. The combination skin type is most common, but its definition is vaguer than the definitions of the other skin types. METHODS: We measured facial sebum secretions with Sebumeter. Sebum secreti

BACKGROUND: Enlarged facial pores have been esthetic problems and have become a matter of cosmetic concern. Several factors are supposed to be related to the enlargement of facial pores, although scientific evaluations were not performed yet. OBJECTIVE: To assess the correlation between facial pores and possible relating factors such as age, gender, sebum secretion, skin elasticity, and the presence of acne, using objective bioengineering instruments. METHODS: Sixty volunteers, 30 males and 30 f

BACKGROUND/AIMS: Facial skin is usually classified as dry, normal, and oily in the cosmetics field. However, there is no standard objective method for classifying facial skin. METHODS: We measured sebum excretion with Sebumeter at four sites on the face. Based on the amount of sebum secretion, we reclassified skin type according to the guidelines provided by the manufacturer. The mean of sebum excretion (mean facial sebum excretion; MFSE) was also calculated. RESULTS: People secrete varying amou

BACKGROUND: It is generally accepted that the severity of acne is correlated with facial sebum secretion. However, previous studies on the relation between seborrhoea and the development of acne did not consider topographical differences in facial sebum secretion and used relatively vague acne severity grading systems. OBJECTIVES: To elucidate the relation between topographical variations in facial sebum secretion and the severity of acne in women. METHODS: Forty-six female controls and 46 women

Few population-based studies have focused on the epidemiology and comorbidities of chronic urticaria (CU) or chronic spontaneous urticaria (CSU). The objective of this study was to obtain information on the epidemiology and comorbidities associated with CU and CSU in Korea. We conducted a cross-sectional analysis using a national health insurance database. An algorithm based on the International Classification of Diseases, 10th revision, was used for the identification of patients with CU and CS

BACKGROUND: The increased sebum secretion has been considered as one of the pathogenic factors of acne. OBJECTIVE: The goal of this study was to assess the correlation between the casual sebum level and the severity of acne using objective measuring methods in a large acne patients group. We also investigated the influence of age or gender on the correlation. METHODS: A total number of 914 acne patients were recruited. The standard digital photographs were taken, and the acne lesions were counte

BACKGROUND: Little is known about the clinical characteristics of acne based on the age of onset. OBJECTIVES: The aim of this study was to investigate the clinical characteristics of patients according to the age of onset of acne and evaluate whether the findings were related to regional differences in the density of Propionibacterium acnes or the levels of sebum secretion. METHODS: A total of 89 women were recruited. The acne lesions were assessed by counting the lesions using standard digital

A long pulse duration 595-nm PDL was found to improve acne erythema with minimal discomfort and an increase in skin elasticity.

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