A lot of people bruise easily for various reasons. Let's start by eliminating some, aging being the first, cancer and chemotherapy being next.
So here are a few others and I am not going into depth on these but you can message me if you want to:
The first suspected one is Nutritional deficiency and this could be Iron, Zinc, Vitamin K, Vitamin C. You can correct these naturally with your diet. Here are a few things you should constantly eat if it is this: amla, citrus fruits like oranges, mosambi, sesame seeds, beetroot, bananas.
But then it could be Von Willebrand disease, Thrombophilia or the opposite Hemophilia, or Ehlers-Danlos syndrome. These you should leave until you have eliminated the others and have your doctor run the tests.
Lastly it can be caused by medications and certain supplements you might be taking. If you are taking anything do some research on the side affects.
Now that you know this we can start narrowing down what is really affecting you.
We would also need to look at your daily routine to be aware of all the things with which your body physically comes in contact. Any touch anyone might do may not show harm, but show a bruise later. This could be any family member or friend with which you might touch or tousle.
If you want me to help you search through these just ask in a message to me here on this site.