Two possible classifications of facial skin type by two parameters in Korean women: sebum excretion rate (SER) and skin surface relief (SSR)

Abstract

Background/alms: Worldwide there are many skin care and makeup products intended to maintain good appearance or youthful skin. However consumers don't know which products are suitable for their skin because they don't know their skin type exactly. To solve this problem, this study suggests two possible classifications of facial skin type by using simple methods. Methods: In 662 healthy volunteers, sebum excretion rate (SER) on the forehead and cheek, and skin surface patterns on the cheek were examined by using Sebutape® and skin replica, respectively. Results: The measured SER values from the forehead were 0.06‐4.56 ng/cm2/min and those from the cheek were 0.04‐3.80 ng/cm2/min. From these data, five facial skin types were classified by SER: low SER type, medium SER type, high SER type, combination‐1 SER type, and combination‐2 SER type. Twelve facial skin types were also classified; they were determined by star formation (SF), primary lines (PL), secondary lines (SL) and pore size from magnified skin surface relief (SSR) of the cheek. Conclusions: From this study, we suggest new classifications of skin types by SER and SSR. The SER and the parameters of skin surface texture (SF, PL, and SL) decreased with age and the pore size increased with age. Although these methods did not classify facial skin types perfectly, we were able to check consumer's facial skin types simply and more quickly.

The Conundrum of Skin Pores in Dermocosmetology

“…Replicas used to collect information about the skin surface can be used in different ways to collect information about pores [14, 15, 16]. The most widely used material for skin replicas is silicone polymer, but one major pitfall is the presence of air bubbles in the replica, especially at the site of pores.…”

EEMCO Guidance for the in vivo Assessment of Skin Greasiness

“…The SER of the firsthour sampling usually ranges between 0.5 and 2.5 Ìg/cm 2 /min on the forehead. On the cheeks and scalp, it varies from 0.1 to 0.8 Ìg/ cm 2 /min [37,[66][67][68][69]. TAS values yielded by the lipid-sensitive tape method represent a surrogate of SER evaluations.…”

Regional Difference of Inflammatory Acne Lesions According to β-Defensin-2 Expression

“…Facial areas can be categorized as T-zone (high-sebum-secreting area; forehead, nose, chin area) and U-zone (lowsebum-secreting areas; both the cheek areas) on the basis of sebum secretion levels (Park et al, 1999). One previous study showed that noninflammatory comedones in the T-zone (especially chin) and inflammatory lesions in the U-zone were significantly associated with local sebum secretion (Youn et al, 2005).…”