Horizontal neck lines (“necklace lines”) are common by age 40 due to repetitive folding, collagen loss, and skin thinning. The most effective treatment depends on severity, but hyaluronic acid (HA) filler is generally the best single option for moderate, static lines. When injected superficially with a soft, low–G’ filler, it directly fills the crease and produces natural-looking improvement that can last up to a year.
