Conversation: The conversation between human and AI assistant.
[|Human|] Hi, I am on blood thinners. I hit my shin pretty hard on a bike 6 days ago. The bruise was less than the size of a tennis ball but now has grown to 4 times that size and keeps expanding. I can tell because the older part is yellow but the outside keeps getting blue and purple. Should I see my doctor?
[|AI|]  His there. A bruise usually goes through color changes over time. It can change from red color initially to yellowish brown by end of the week. But it is expected to decrease in size after the first two days.It's my opinion that since you are on blood thinners, an increase in size of bruise should be reviewed and seen by a doctor in person, as blood thinners can cause accumulation of blood in the area of bruise. U might need blood tests to review your parameters.In the meantime application of pressure by a crêpe bandage can help control the swelling. It is best if you can meet a physician and get the swelling and color changes reviewed by her/him. All the best. Regards.