Hi, I had a small cyst in my left side armpit and had it removed 2 weeks ago. It turned out to be a breat tissue but it was not cancerous. After the surgery, however, I've had severe pain and swelling in my whole left arm and my breast surgeon doctor said it's from the blood clots. She told me to to take Aspirin but I have bad allergy to Aspirin and I need to take alternative medication. Which one would you recommend: Heparin or Warfarin? If I have to take Heparin, how long (or how many days) should I take it? Also, I am wondering if the person who has severe allergic reaction (swelling, fever, redness, itchiness, rash, etc.) to Aspirin also has the same allergic reaction to Heparin or Warfarin? Are these three the same kind of medicine? Thank you for your time...