A stretch mark begins as a wound she cannot see. The skin has been pulled, by pregnancy or by adolescence or by a Wegovy gain that came too fast and a Wegovy loss that came too suddenly, beyond the elastic capacity of its dermal scaffolding. Collagen fibres fracture. Elastin networks tear. A small inflammatory cascade follows, beneath the surface. B y the time the line appears on her skin, the injury underneath is weeks old. This is the first thing worth understanding about a