Another pede posted a list of compounds that are ferromagnetic. Co and Ni are both on the list and would likely cause a magnet to stick to the skin.
in 2019, MIT did a report on storing medical info below the skin invisible to the eye though vaccines. You guessed it, the research funded by Bill and Melinda Gates foundation. QUANTUM DOTS (microchips?) can be an invisible dye in the vaccine that can only be detected with tech like cell phone apps. The research is a couple years old and discusses using a microneedle patch rather than syringe and needle. 2 years is more than enough time to perfect delivering Quantum Dots Dots in syringe and needle like the Covid vax. So, contrary to Melinda's statement, the technology absolutely exists. https://news.mit.edu/2019/storing-vaccine-history-skin-1218
What are QUANTUM DOTS? Magnetic Quantum Dots are made from Co and Ni. https://pubs.acs.org/doi/10.1021/ja036811v
I'm no scientist and am doing more in depth research but so far it appears to be a reasonable explanation....
Nickel often causes allergic reactions on contact with skin. I wouldn't want in my body.
"Immune system reaction to nickel is a potential complication of stainless steel usage within the human body."
from: https://en.wikipedia.org/wiki/Surgical_stainless_steel
Something is causing allergic reactions in many people, obviously. The lipids encasing the mRNA part are protein, so there's that. Throw in Ni and get more.
I have a bad nickel allergy. It is very common - estimated 18% of Americans have it. Could be problematic.