Can a Hickey Cause Capsular Contracture?

Take it easy, there!  It should not cause a capsule but could traumatize the healing.  You need to be aware of any soreness, swelling, redness or pain.  If you have those symptoms, then you should see your plastic surgeon and explain exactly what happened.

While the superficial bruise from a "hickey" most likely won't affect the capsule, the one thing that I would think about is whether there is any increased swelling or soreness in the breast itself.  If the breast was handled roughly that soon after surgery, the capsule could still be damaged or torn, and this could lead to some bleeding into the capsule which could then stimulate capsule contracture.  If there is any soreness of the breast or firmness, it is best to have it checked by your surgeon.