I have seen some excessive bruising (in one training partner) but that was eventually taken care of by modified dose. It was expected that the dose would eventually be modified so no great surprise.
I guess the take home message is keep your doctor informed.
I hope you are well.
The only problem I was told by my doctor to beware of was excessive bleeding in the case of injury, such as being accidentally hit by a bokken or jo. Luckily, we have two medical doctors and one paramedic who regularly practice.