Hi, sometimes I do get brusies too but they start out black/blue and slowly turn to yellow or greenish color. Bruising without knowing how it got there(didn't hit or bump anywhere) could be something serious or something benign. Sometimes serious could be cancer but usually, as what I know, the bruise are usually big and ugly black/blue. Easy bruising can also be due to your diet. There's a vitamin where you take too much might make your blood thinner or so... but I can't remember which. Skin hot to the touch might be inflammation or something... How long have you had these symptoms? Go and see your GP if it has been longer than 2 weeks. Maybe a blood test might help to see if there's anything wrong with your immune system. Good luck! :)