Shein white jeans, high waisted, women’s 26x32, a few spots on back

Shein white jeans, size 26x33, women’s. My daughter bought these but only wore a couple times as they were too tight. High waisted, in great shape, but do have 3 little dark spots/stains on back on legs toward bottom, might come out, I haven’t really tried to treat it. See pics for better detail. Smoke-free home.