There is a posability of bursitis. Is there pain on kneeling, does it ache deep below the knee cap? If yes you may have prepatellar bursitis. If you've had it for a while it might only be a dull ache now. I havn't really had any contact with bursitis since i graduated 4yrs ago but a Massage Therapist should be able to do something for you. Unfortunatly if your job requires you to be in a constant kneeling position therefore pressing on the bursa behind your knee cap you may not get full relief, if that's the case the treatments will prob be long term, and even once it's gone there's a good chance it will recure. Things you can do at home: Acute stage (in the very begginning): Rest from things that cause pain, Cold, ice, cool or frozen towels. Do not compress the bursa. Chronic stage(you've had this for a while):Contrast baths of mild temperatures to begin with. That's when put use cold and heat, cold for a bit then hot, then cold, then hot, etc... A massage therapist will be able to tell you what stage your in and exercises and other things you can do at home to help your self heal better and faster. Well I hope that answered your question and that i didn't leave anything out.

Alternate applications of heat and cold are very helpful in reducing swelling not based in an actual injury. An ice pack for five minutes, then two minutes rest, followed by a hot pad (but only hot, not HOTT) for five minutes and another minute of rest is a workable cycle and has been known to reduce swelling caused by a sharp blow to the knee. Again, no real damage was involved.