Hie, I Kinda Developed An Allergy(hives To Be Appropriate) And

Hie, i kinda developed an allergy(hives to be appropriate) and soreness in the arm after taking CARPELA, my doctor suggested FLEXURA (Metaxolone & Diclofenac) as a muscle relaxant and LORFAST (Lorfast) for Allergy .. There is no betterment in the rashes .. So then i consulted a Dermatologist, she doubted that these rashes got worsened by the muscle relaxant i used, and prescribed me DAZIT 5mg and Cetcip (L-Citrizine) .. well i doubt that i'm allergic towards the Colorant - YELLOW OXIDE OF IRON ..
Now my doubt is is it possible that people develop allergies towards the Colorants ??