There’s a new emerging trend among female workers in London. They’re having Botox injected on their feet to alleviate pain from wearing high-heeled shoes.

According to reports, more and more women are using collagen to plump up the balls of their feet instead of using foot padding. The new treatment has even earned a name—foot fillers.

However, doctors say that the effects are not long term. Due to the nature of the heel (it’s a high-impact area), foot fillers will only last about three months per treatment. And its standard rate is as expensive as typical applications of Botox.