Volumizing products such as hyaluronic acid or fat can be injected into the scar. This procedure is regularly effective in treating the hollow nature of the area. It does not treat any redness and has no smoothing or erasing properties. What’s more, the effect is not permanent, and regular re-injections are required. In the case of hyaluronic acid injections, the main advantage is the regular simplicity and swiftness of the treatment.