Black marks after chickenpox are very common and are usually a type of post-inflammatory hyperpigmentation, which means the skin becomes darker after healing. These marks often fade gradually with time, but it may take a few months. To help them fade faster, the most important step is to use a broad-spectrum sunscreen daily, as sunlight can make the marks darker. You can also use gentle skin-lightening creams containing ingredients like vitamin C, niacinamide, azelaic acid, or kojic acid, which are generally safe and effective over time. Keep your skin well-moisturised and avoid picking or scrubbing the marks, as this can worsen pigmentation. If the marks are deep or not improving after a few months, a dermatologist may suggest stronger treatments like prescription creams, chemical peels, or laser therapy. With consistent care and patience, most marks improve significantly.