How to do a skin analysis before a facial treatment

A better skin analysis changed the way I plan facials. I used to listen to the client's label first: oily, dry, acne, sensitive. Those words help, but they can be misleading. A client may call herself oily because her T-zone shines by lunch, while the cheeks are tight and dehydrated. Another client says sensitive, but the real issue is that she used strong actives three nights in a row. Before I…