Dear patient, Thanks for your health concerns. Sometimes we give the same substances, steroids, as an IV injection but in a gradual diluted infusion; since there was some complication with the application itself, certainly there would be a risk of infiltration (fluid going into the tissues), a clot or thrombus (phlebitis) or local irritant reaction. My best suggestion would be to see the provider who perfomed the procedure so that he can identify if there are any serious complications, since that provider knew your anatomy (how your arm looked) before the procedure. Hope that is helpful, wish you the best health, Dr Brenes Salazar MD Mayo Clinic MN