The rings of Venus are transverse wrinkles on the neck, which, unlike other skin wrinkles, are considered to indicate a woman's age. They usually form at the age of 20-25 years, of course, over time they become more noticeable and pronounced.
In addition to physically filling the furrow, fillers increase the elasticity of the skin, hyaluronic acid attracts water molecules, so the skin of the neck becomes more hydrated and taut.