I Fractured My Knee And Am Using Crutches. I've Started

I fractured my knee and am using crutches. I've started taking a multi vitamin, l-lysene, vitamin c, calcium, magnesium and continuing alendronate to help heal the fracture. I'm drinking extra milk and eating yogurt every day. I have developed tiny raised bumps (rash?) on my arms from my wrists to my upper arms. Could any of these things have caused my rash? The crutches look like aluminum and do touch the insides of my arms, but I have bumps where the crutches don't rub also. I've also upped my fruits and veggies (nothing new to me) so that I don't gain weight while I'm inactive with the knee.