silver nitrate?

My daughter(age 13yo) has a feeding tube and the GI will use it (stick)around the tube site when she gets granulation tissue building up. She hates it. She is pretty good with pain, but, she will scream when they do it and is not happy for about 6 hours afterward. I am only in school, so have no other experience with it.

My daughter is seen in DE and the GI nurse practitioner uses the sticks on my daughter's g-tube site for granulation tissue.

After the most part of his umbilical cord fell off, my son was left with what the pediatrician called a "granuloma", which he then cauterized with silver nitrate. I was assured that it was extremely rare that he would have any reaction to it. The next morning I noticed that the skin around his belly button looked like someone had burnt it. It was red and swollen and had tiny blisters. We called the ped and he was hospitalized for 2 days, taking rounds of antibiotic and blood work at just 3 weeks old. I have yet to find any information on the internet about silver allergies. All I can find are pages about nickel allergies. Can anyone help me?