This treatment has been dubbed "The Korean Filler Facial". It is a collagen-inducing procedure without downtime or needles. This non-invasive, anti-aging skin treatment softens fine lines & wrinkles by plumping skin and adding back volume to the face and neck. The HOUSE OF PILLA, HOP+ Pilleo mask treatment consists of the highest concentration of poly l-lactic acid, which stimulates the production of collagen.