I have bruises on my legs, but I don't remember bumping into anything?

It is possible that the bruises on your legs are due to scratching from dry skin or friction caused by physical activity such as biking. If the bruises have not increased in number or size and you don't have any other symptoms, it's recommended to monitor the situation for now. You can try applying a fragrance-free moisturizing cream like Aveeno whenever you feel the need to scratch. If you have any other questions or concerns, feel free to ask for further assistance.