Your absolutely right, when I showed my swollen eyelids to my dermatologists he said that it could not be because of minoxidil or the ketoconazole shampoo. He said that skin looses elasticity as you age in that may explain the puffy eyes without further investigation.While this could be true to a certain point it does not happen overnight. You don't go to bed looking fine and waking up the next morning with heavy bags under you eyes,headache and shortness of breath, all minoxidil overabsorption symptoms ( I read that retina-a triples the minoxidil absorption which is probably the culprit).