Ouch! Apply with caution!
I love the range of Hurraw lip balms and have used them for several years.
But this SPF balm gave me a bad reaction - my lips became inflamed and little sores developed at the corners of my mouth, it was annoying and painful.
I notice that this particular lip balm has a warning about possible irritation on it, so this probably happens to other people too. If you decide to give it a go, I would suggest just using a tiny amount to test it first - if your lips feel okay the next day it's probably ok for you.
As for myself, I will stick to the other products in the range and do without the SPF protection.