For a couple days now i have marks on both of my breast that almost look like hickies. why, what could it be? should i be worried?

See answer : A hickey is a bruise usually given with informed consent. Most common cause of bruising of the breast would be some type of direct blunt trauma that may or may not be recalled, which is sometimes as simple as an ill-fitting bra. Those taking any anticoagulant medications, or an underlying coagulopathy, would be more prone. Would recommend palpating for lumps and brief trial of observation.

Possible bruise: It sounds like you may have gotten bruises on your breasts. This can happen sometimes and you may not remember the cause. Bruises usually resolve after a week or two. I would observe these changes for a few weeks but if hey do not go away in that time period I suggest you see a doctor for an evaluation.