they are actually not all the same and there are ones that should never be used in the lip. one thing that's very important is to find a dermatologist or plastic surgeon who is familiar with the different products available and can choose a product that's best for you. i tend to prefer only hyaluronic acid products for injections in the lips and that would be products like restylane or juvéderm ultra. these have a very natural look in the lip because hyaluronic acid is a natural ingredient to the skin and it holds water in the skin and can give a very nice natural plumpness to the lip and to the lines around it. but it has to be done very carefully and gently in order to look natural.
i have upper lip wrinkles and my lipstick bleeds into my lip line. i‘m thinking about fillers but how do i choose one?