Sang Woong Youn

The elderly have less elastic skin and more wrinkles. Skin hysteresis most closely related with the degree of wrinkles. Drier skin showed more wrinkles and deeper furrows, with wider intervals. On the basis of these objective findings, we propose several skin parameters associated with wrinkles, and hypothesize the mechanism of wrinkle generation.

We showed that the face shows definitive regional and seasonal variations in sebum secretion. To define the combination skin type, seasonal variations in sebum secretion should be considered in addition to regional variations.

Male, increased sebum and decreased skin elasticity were mostly correlated with facial pore development. Further studies on population with various demographic profiles and more severe acne may be helpful to elucidate the potential effect of aging and acne severity on facial pores.

We showed that subjective skin type does not match the amount of sebum secreted. Thus, this simple and subjective classification is of very limited use and it should be re-evaluated by using an objective and standardized measuring tool.

Increased levels of facial sebum secretion were observed in patients with acne. Our findings indicate that increased sebum levels do not directly cause development of acne lesions.

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

The results of this study, using objective evaluation tools, suggest that late onset acne has different clinical characteristics. Other possible factors might explain the clinical differences in late onset acne.

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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This is the first study to evaluate the correlations between pH, age, gender, and acne development in a large acne patients group using an objective, bioengineering method within the viewpoint of skin pH. We could expect that there are gender differences in the correlation between pH, age, and acne development. From this result, we could provide a clue to the treatment of acne, that maintaining the pH balance according to the difference of gender and age is an essential consideration.

The red fluorescence area showed a stronger correlation with sebum secretion than with the presence of P. acnes. This finding suggests that the red fluorescence is affected by sebum not just P. acnes.

Severe psoriasis is a systemic inflammatory disease involving major arteries and internal organs. The association between psoriasis and arterial inflammation, however, has been noted mostly in patients with moderate to severe psoriasis. Therefore, it is still not clear whether mild psoriasis also increases the arterial inflammation and cardiovascular disease. In this study, we aimed to investigate systemic inflammation using (18) F-fluorodeoxyglucose positron emission tomography/computed tomogra