People have been doing such things for ages for creating sensation and fame. Poison ivy causes harmless temporary markings treated easily with cortisone cream. You may try it.
I think it was in the 1970s that a pregnant lady Zahra Fona from Indonesia toured the world along with her husband claiming that the baby in her uterus constantly recited the Quran. Doctors in Pakistan detected a small tape recorder hidden in her private parts. The couple then admitted that they had been doing this for fame and money.
Then we have seen Quranic verses carved on fruits, trees and animals quite obviously the work of a knife or razor.
Please remember that I am a physician and I can easily tell the markings of poison ivy on human skin.
Finally, Allah does not play games with people. He wants us to believe in the Truth using our reason and not by gimmicks.
This should be enough evidence, dear Annas.