Hello, Welcome to healthcare magic. I understand from your query that you concerned about your uneven skin tone. Glyaha Koj lotion contains hydroquinone. Hydroquione which is a potent bleaching agent. It is well known to cause side effects like rebound pigmentation and ochronosis if used unsupervised and for prolonged periods. Rebound pigmentation, as is self explanatory is recurrence of pigmentation after prolonged use. Ochronosis is a less common side effects and occurs due to deposition of a brownish black pigment in the skin after prolonged use of hydroquinone. This is very difficult to get rid off once it develops. To lighten the spots, you could use a cream containing 2-4 % Kojic acid and vitamin C at bedtime. Use a broad spectrum sunscreen every 4 hours during day time. You could also get glycolic acid based peels done by a dermatologist. Hope this helps you. Take care.