No need to bring a First Aid kit or every item in your 10-step skincare routine, but you may want to toss face powder or concealer in your bag if you plan on going somewhere after the appointment. To make sure the derm has the best view of your forehead (or whichever area they are injecting), the nurse will take off any makeup near the area with an alcohol wipe. I keep It Cosmetics's Bye Bye Redness Correcting Cream ($32) close at all times so I can squash any redness as soon as it comes.