You mean that you have Osgood Schlatter disease. This is an overuse injury so your gymnastics activity might have something to do with it. This is what I have searched online:

---quote---
If a doctor thinks someone has OSD, he or she will examine the knee carefully and might take an X-ray to help find the cause of pain. In addition to doing a physical examination, the doctor probably will ask about any concerns and symptoms you have, your past health, your family's health, any medications you're taking, any allergies you may have, and other issues. This is called the medical history.

Most people with OSD are able to continue playing sports. If someone's pain is severe, the doctor might recommend taking a short break or trying activities with less jumping and running for a while. Ask your doctor about stretching exercises that can help relieve some of the pain while keeping the area strong and toned. These exercises often include quadriceps and hamstring stretches.

Icing the affected area after sports can also help to relieve pain and swelling. A doctor might also prescribe anti-inflammatory medications, like ibuprofen, to treat the pain.

The good news is that OSD usually goes away on its own after the growth spurt has ended.
---end of quote---
Source(s):
http://kidshealth.org/teen/food_fitness/sports/osgood.html

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As getting up in age and having crashed my knees skateboarding, etc. I highly recommend knee pads or braces.

I have found a lot of support and relief from Volleyball knee pads with the gel cushions (Asics in black with a clover leaf shaped foam pad and circular cutout behind knee--Big 5 sporting goods,) and also a stretch fabric legging that Wal-Mart sells under their own label in their little sports section (weight lifting, etc.) that has a black & beige fabric with the letters "STG".

Some types don't fit right and and block the blood flow or get uncomfortable but the above are so transparent that you can forget you are wearing them--just be sure to try them on or read the sizing chart.

It's amazing how much strength they can add to your legs, and also helpful for squatting and other work.

Re rash: http://healthlibrary.epnet.com/GetContent.aspx?token=70ff5260-81bd-4de1-9998-14fc98aa9133&chunkiid=11753
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