A RealSelfer shared "after doing some online research I have discovered that "Hourglass deformity" - a caving in of the temples due to muscle loss - is a reported side effect of Botox use (B. Guyuron, K. Rose, J. S. kriegler og T. Tucker, 2004. Hourglass deformity after botulinum toxin type A injection. Headache 44, 262-264.)...The Botox use mentioned in this article was to treat migraines..."
Is this deformity something that could be seen in people using Botox for cosmetic purposes too, or is it somehow specific to use associated with migraine treatments?