This study aims to verify whether understanding and knowledge acquirement of cosmetic ingredients increase satisfaction in the use of wrinkle and acne, skin-lightening cosmetics. 61 estheticians who own skin care salons in Gwangju participated in survey, and the results are as follows. First, as there is more understanding about skin care cosmetics and more knowledge about cosmetics ingredients, there was a significant effect in satisfaction of using skin-lightening cosmetics. Second, understanding about skin care cosmetics did not have significant effect on satisfaction of using acne cosmetics, but knowledge in skin care cosmetics ingredients had significant effect on satisfaction of using acne cosmetics, showing a difference. Third, understanding about skin care cosmetics did not have significant effect on satisfaction of using wrinkle improvement cosmetics, but knowledge about skin care cosmetics ingredients had significant effect on satisfaction of using wrinkle improvement cosmetics, showing a difference. Fourth, the period of showing the effects after using each type of skin care cosmetics was after 4 to 6 months in all of skin-lightening cosmetics and acne, wrinkle improvement cosmetics; and satisfaction about the use was in the order of skin-lightening cosmetics, acne cosmetics, and wrinkle improvement cosmetics. The results show that estheticians can increase the effects of care through continuous education about ingredients in using cosmetics.