When you apply vitamin C serum to active acne, the acidic nature of the serum can irritate your already inflamed skin. This irritation can lead to increased redness, swelling, and discomfort. Additionally, the serum may not be able to penetrate the skin properly due to the presence of acne lesions, reducing its effectiveness in delivering its benefits. This can result in a lack of improvement in the appearance of your skin and may even exacerbate the acne breakouts. It’s best to avoid applying v