My grandson was recently released from the hospital where he was receiving treatment for his CF and minor surgery for a cyst in his nose. The meds they put him on to fight the infection caused by lancing the cyst gave him a terrible rash. He was released from the hospital, then last night was suffering from knee pain so bad that he felt that he could not walk. He also experience pain in the muscles on the back of his arms, as well as large itching bite like spots on the scar tissue on his back from surgery that he had years ago. Any thoughts?