What Causes Itching Along With Raised Lumps Around The Area Of Implanon Placement?

Hi I have had implanon in my arm since July 2012. In the past week including right now I have suddenly begun to have itchiness at the site of the implanon with raised bumps that almost look like an insect bite. Should I be concerned? I am contemplating taking an antihistamine but don t know if I should be rushing to the doctor instead.