I have never had a problem with bruising from seeing a massage therapist; however, if your MPN included increased hemorrhage as a symptom, then deep tissue massage would not be a good idea. Suggest that you have your MPN care team look into the issue of bruising. I did used to experience this when my PLTs were near 800 and i was on aspirin. Note that the higher you PLTs go, the more prone to hemorrhage you can become. In fact, at very high levels, the risk of bleeding is higher than the risk of clotting.

Your MPN care team can look into the issue by checking your PT/INR and a running a von Willebrand Panel. Suggest you follow up with them for the best answer.