For example if we have x=953, I want to select specifically the first digit (or the last two) and save it in another variable, so the outcome would be y=9 (or y=53)
Hydroquinone has also been linked to a medical condition in humans called ochronosis. This condition has actually been found in humans, not rodents, but the evidence is inconclusive at the moment. Ochronosis is a condition where the affected skin darkens in color, and also becomes thicker in texture.
If the peel is purposely deepened, as is required for the treatment of wrinkles, healing can take as long as fourteen days. The redness of the skin will persist for two to six weeks. After the skin has peeled, the patient is again given tretinoin and hydroquinone. The darker the skin color, the longer hydroquinone is used after the peel. I encourage the long term use of tretinoin. Any peel can cause scarring if performed too deeply.