swollen ankle bruise?

so i know im not drinking enough water and commonly my ankles are slightly swollen in this heat.(phx,az) and i have a bad habbit of crossing my ankles when im relaxing out side and normally it leaves a dimple for like 10 mins then goes away. this time i uncrossed and there was a bruise in the dimple.. never happened before. and my dimple only lasted 2 mins this time but.. the bruise is still there.. weird or normal any ideas what should be done?(yes i need to shave.. lol)