Allure noted in its piece that board-certified dermatologist Shasa Hu, MD, previously told the outlet: “A blistering sunburn can trigger a whole-body psoriasis flare, as sunburn can be thought of as systemic injury to the skin. This is why, although natural sunlight at a very low dose and medical UV therapy are known treatment[s] for psoriasis, sunburn is a big no-no for psoriasis patients. The same goes for tanning bed use.”

Source: https://www.buzzfeed.com/leylamohammed/kim-kardashian-shares-painful-psoriasis-flare-up-praised