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Background and Objective: Infrared (IR) rays, which comprise approximately 40% of the solar radiation which reaches the earth's surface, have received relatively scant attention. As no standard method has yet been agreed upon for the biological evaluation of IR irradiation, the objective of this study is to suggest a new unit for IR irradiation. Methods: The skin temperature of 38 Korean volunteers was measured after IR irradiation with varying irradiance. Results: Skin temperature after IR irradiation at an irradiance of 2.02 W/cm2 remained unchanged after 652±22 s (mean±standard error), which corresponds, in this case, to a total radiation dose of IR 1317.3±44.84 J/cm2. This quantity was designated as the minimal heating dose (MHD). We also demonstrated that MHD increased with increasing IR irradiance at lower IR irradiance (1.17 and 2.02 W/cm2), whereas it became constant at higher irradiance (2.87 and 3.22 W/cm2). No statistically significant correlations were detected between MHD and volunteers' ages, erythema index, or melanin index. Conclusion: We propose ‘MHD’ as a biological unit for the measurement of IR irradiation. [ABSTRACT FROM AUTHOR]

Presents several correspondence on dermatology. Characteristics of striae distensae; Occurrence of gianotti-crosti syndrome in infants following immunization; Examination of phakomatosis pigmentovascularis.

Studies the characteristics of vitiligo among children in South Korea. Natural history of the disease; Clinical characteristics; Laboratory findings; Family history; Associated diseases.

Perifollicular fibroma(PFF) is a rare cutaneous hamartoma that shows differentiation in the connective tissue sheath of the hair follicle. It may be single (congenital or acquired) or multiple (late onset). We report a 14-year-old Korean boy with a congenital solitary PFF on the face, which supports the nevoid concept of origin rather than a reactive response to injury. [ABSTRACT FROM AUTHOR]

Generalized perforating granuloma annulare presents with flesh- to red-colored, 1-5 mm papules with a central umbilicated crust or scale that usually involves the extremities, face, neck, and trunk. Perforating granulomas are demonstrated on histopathology. Our patient is a 68-day-old girl with generalized perforating granuloma annulare. [ABSTRACT FROM AUTHOR]