I have rheumatoid arthritis and have a problem with my shins, it started as raised bumps under the skin, then 3 days ago the area now has very small red dots on the raised bumps, also my lower legs are now throbbing, am on methotrexate 25mg weekly and oxycontin 20mg twice daily, I am 59, 5ft 9ins and weigh 9st 12lbs