My bruises that show up out of nowhere are starting to worry me. I am not injured.

Leg. Slightly purple and fading away. Multiple spots. They do not hurt.

Chest. Oldest bruise and in a green shade. Strange place for a bruise without injury to appear. Doesn't hurt but is healing slowest.

Arm area. Newest just discovered today. Doesn't hurt nor did I bump into anything. Faint but brownish