So, I'm no Japanese culture expert, but I am glad to see the youngsters so concerned about their health.
Show your clients that you know how to have a good time!
Yes, apparently this is a Thing in Japan. They inject saline solution into their foreheads (or other parts of their body) and can shape the lumps in all sorts of ways. The effect usually lasts for a day. My question is, if this suddenly became big in the United States, how many Trekkies would start dressing up as Klingons and Ferengi all the time?