Brief Answer:
Rest, ice, knee brace/pad, and mild anti-inflammatory

Detailed Answer:
Hello sir and welcome.

Thank you for writing to us.

I have gone through your query with diligence and would like you to know that I am here to help. In such a situation, I would recommend the following:

1. Rest, knee pad a few exercises along with mild anti-inflammatory medications. The blood should get absorbed into the body over a certain period of time by itself

2. If the above fails, then a needle may have to be inserted and drained; during this process some amount of cortisone can also be injected, and the patient can be initiated on a course of antibiotics.

This can be undertaken several times if recovery with this method is possible.

3. If the above fails, then surgery should be considered.

For now, I would recommend you to start with option 1 as your pre-patellar bursitis contains only blood and no other fluid.

Please feel free to write back to me for any further clarifications, I am always here to help.

Best wishes.

---