We’ve all bemoaned good or bad hair days, but how about good or bad skin days? To me, there’s far more day-to-day variation in one’s skin than one’s hair, plus far less control. I mean, when I am having a bad hair day, the cause is clear (I haven’t brushed and/or washed my hair) and the answer is equally clear (I must wash, then brush, my hair). Yet when I am having a bad skin day, the answer and solution seem inexplicable. What went wrong? How can I fix it?