Topical primrose (Primula obconica) extract may help treat alopecia areata. 140
Although studies are limited to a handful of cases, leaves from the poison primrose plant reportedly work in this type of hair loss by sensitizing the scalp skin. In a case study involving a woman with alopecia areata, significant regrowth occurred by placing a fresh leaf once a week on the balding scalp area. Growth began after one month and was clearly noticeable after two months of use. It did cause a blister as a side effect. 140