Sometimes it is about the extremely thin lips, sometimes it is about those crow feet or the laugh lines and sometimes it is about those prominent dark circles that happened just because the eyes got into hollows on account of weight loss. Wrinkle Injections and Dermal fillers are the solutions to solve a plethora of other concerns too where either some function has to be stopped for a while (aging and hence fine line formation for instance) or some volume needs to be added (thin lips or under eye).
Source: https://www.kosmoderma.com/treatment/anti-aging-botox-dermal-fillers/