Lip Allergy due to lingual braces? (Photo)

I am 27 years old and I got lingual braces an year ago. Ever since I started wearing braces my lips are swollen , burning and then turn black. Sometimes they bleed on the corners. I am assuming that my lip allergy is due to braces since I am allergic to nickel. By my orthodontist says that my lip allergy is not due to braces. please suggest what can be done to mini minimize the allergy as I cannot afford to get my braces removed anytime soon. Thanks in advance.

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