Detailed answer

There are a few reasons why your skin may appear dull after using certain serums. Firstly, some serums may contain ingredients that can cause irritation or allergic reactions, leading to inflammation and a dull complexion. Additionally, certain serums may not be suited to your skin type or concerns, and their improper use can result in lackluster skin. Another possible reason is that serums may be stripping away natural oils, leading to dehydration and dullness. It's also vital to consider the overall skincare routine and lifestyle factors such as diet, hydration, and exposure to environmental aggressors that can impact skin appearance. Lastly, if the serum you are using is expired or improperly stored, its efficacy may be compromised, resulting in lackluster results. It is essential to choose serums formulated for your skin type, address your specific concerns, and ensure proper application and storage to maintain a healthy, radiant complexion.