After Lichen Planus heals, it commonly leaves behind dark marks called post-inflammatory hyperpigmentation, which are harmless but can take time to fade; the most effective approach is regular sun protection (daily sunscreen with SPF 30 or more) to prevent further darkening, along with gentle skin care and doctor-recommended creams such as mild depigmenting agents (like azelaic acid, kojic acid, or retinoids) that help gradually lighten the spots. Avoid harsh scrubbing or home remedies that can irritate the skin and worsen pigmentation. These marks usually improve slowly over months, not days, so patience is important, but if they are very persistent, a dermatologist may suggest treatments like chemical peels or laser therapy for faster results.