Hello, back in April I did an at home 30% glycolic peel, never again, a month later I was in the sun and within days brown spots were on my forehead. Went to a derm and she perscribed 4% hydroquinone and .5% generic retina. After 5 mos the brown spots have faded so I stopped using the hydroquinone, but I noticed 2 small red marks on my forehead. Those are more noticeable then brown spots. What can that be? And what can I do to help those, vitamin C serum? or if the retina alone will help?