You may develop an allergic reaction even though you are properly taking care of your piercing. You may be allergic to the piece of jewelry or your piercing may have been done with contaminated tools. You will know you have an allergic reaction when you experience any of the following: an odd smell, an infection that won't go away, persistent bleeding, redness/inflammation of the area and/or skin lesions. The jewelry's entrance point may be raw, ooze pus or have lesions or blisters. Even worse, you may possibly run a fever because of a bacterial infection.