Each time I have botox to treat the deep line in between my eyebrows and crows feet I get new vertical creases in between these points running through my eyebrows. Further botox to this area always softens them, but they stay for a really long time (this is 4 months post botox). What can I do to get rid of them and stop this happening as they are quite severe. First photo is relaxed face, second is fully frowning but similar results from squinting hard on a sunny day. Thanks