Yin Your Skin® – From Ancient Methods to Modern Self-Care. Yin Your Skin is a holistic beauty concept designed by beauty therapist Katja Kokko. Yin Your Skin brings together the wisdom and effects of ancient traditions creating an unique and sensual wellness experience. Enjoy the visible results of Korean skincare, the best techniques of facial gua sha, the meditative bliss of yin yoga and sound healing – all wrapped up in Nordic stillness and elegance. Yin Your Skin gua sha tools and high performance botanical skincare products complete the concept and reinforce its mission – to teach effective self-care methods that anyone can use to support well-being in daily life.