her buddies often do is to wear a little sticker (flower, bird, heart
) and to allow their skin to tan around that shape. When their tanning is done, they have that shape on their skin. You might consider doing something similar and perhaps -- since you must rotate your infusion sites -- tan with several of those stickers applied.
One of my infusion sites is my butt area ... and, on me, that's covered by a swimsuit.