Please stop using your current skin-brightening cream immediately. It contains active ingredients like hydroquinone and tretinoin, which are too harsh for raw, damaged skin and can worsen the burn or lead to severe dark spots. To heal the burn quickly, focus on soothing the skin. Apply a thin layer of plain petroleum jelly or a healing ointment containing zinc oxide or ceramides 2-3 times daily to protect the skin barrier. Additionally, use a mild over-the-counter hydrocortisone 1% cream for a few days to reduce redness. Always wear a broad-spectrum sunscreen outdoors to prevent hyperpigmentation. If it doesn't improve, please consult a dermatologist.