It doesn't look good, does it? Or is the skin very dry? What kind do you belong to?
It doesn't matter if the previous one is thinner. It takes about 10 minutes to stretch after riding a spinning bike. You can also add some equipment to strengthen your muscles, and it will be gone soon. Don't worry, it will be all right in a minute.
If the skin is very dry and cracked, it's time to oil it. The cheapest oil will do. Ask the ladies at home what oil to touch! Put it on after taking a shower after exercise, and then don't touch it. It is mainly caused by sweating too much, skin moisture loss too fast and dry weather.