You should definately let your therapist know about your feet. And if you are comfortable, explain further about that sensitivity. Is it painful for them to be massaged? Have you had them massage in the past? Are they ticklish? If you decide you would like to try to have them massaged, work with the therapist. They can always go lighter if they are sensitive to pressure. Plantar Fascitis can really be helped with massage if that is part of the sensitivity. Of if they are ticklish, a broader stroke can avoid that. Sometimes more pressure can help. Or even massaging through socks or the sheets. Either way, if you leave your socks on during the session, that is a red flag that you would like that area avoided, the socks become a barrier. But always discuss your concerns with your therapist whatever they may be. Most things are not as uncommon as you might think. Keeping an open line of communication is very important at all times throughout the session to maintain the comfort level of both the client and therapist. Happy massages!