PLEASANT GROVE — Jessica Kruger rolled on an essential oil blend designed to soothe period cramps almost five years ago, but instead of relief, she said she wound up with severe burns. Now the 33-year-old real estate agent from Holladay alleges in a lawsuit that the doTerra product contained more than 23 times the safe amount of bergamot oil — the same substance used to make Earl Gray tea — that can make a person hyper-sensitive to UV rays when applied to skin. It had burned others in the past, but the company continued to sell it without any sort of warning before Kruger ended up in an emergency room, the lawsuit contends.