The 21-year-old model suffers from psoriasis, an auto- immune disease in which scabs appears on the skin, reported Daily Star.
"Psoriasis is the bane of her life and it's been worse than ever in Rio. She's so desperate she'll try pretty much anything now," a source said.
"One of her model pals has recommended applying an oat paste, as well as bathing in oats, to relieve her itchy skin and reduce some redness," the source added.
Earlier this year, Delevingne got a skin advice from fashion diva Kate Moss that helped her deal with a skin problem before an important show.