VDerma Not everyone's skin were suitable for using retinol, because it can cause skin irritation, peeling stimulation, especially in the first time use. If it cause stimulation, the symptoms will disappear within a few days you use it regularly. If the symptoms do not disappear, but more serious, please stop using it immediately! If you have decided to start using retinol, at the beginning, please do not use every day. Use it every other day, or add it to your daily use moisturizer, so you can better adapt to your skin retinol.