This is not something I've heard of before- however, if the pimples are coming before the headache, it could be related to fluctuations in hormones (as some migraine attacks are triggered by hormones- and changes in hormones can cause breakouts in complexion). The only other thought I'd have is about stress. Again, this is ultimately hormone-related as cortisol, a stress hormone, can both play a role in triggering migraine and in causing breakouts.
Please circle back after your new neurologist appointment in January if you're willing to share what thoughts your doctor has. It would be interesting to learn more about this.
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