Complications
Generally the rook piercing presents the same set of complications and risks as other cartilage piercings in the ear, although its concealed nature makes it less prone to accidental snags than other piercings. However, not everyone has suitable anatomy for a viable, long-term rook piercing. Someone with a poorly defined ridge in this area is encouraged not to have this procedure done. An experienced piercer will be able to accurately assess whether or not the client's ear is suited for a rook piercing and will likely refuse to perform the modification on someone with an inadequate ridge.
Some individuals have complained about persistent soreness in the area spanning a year or more, migration, and in some cases even rejection. While some of these issues can arise from improper aftercare and careless handling, many times they are the result of improper placement or poorly suited anatomy. Depending on the size and thickness of one's antihelix in this area, the increased curvature of a CBR (as opposed to a curved barbell) can put undue strain on the healing fistula which can prolong soreness and promote migration. Rejection will only occur in the most extreme of circumstances, usually because of poor placement (too shallow or oddly angled hole) or extreme trauma inflicted on the piercing especially during healing. In general, a person with decent health and proper hygiene is unlikely to experience any complications or pain outside of the normal healing process.
It is also important to refrain from attempting to stretch this area, at least without talking to an experienced piercer beforehand and following their advice. Cartilage normally will not stretch significantly although smaller gauge stretchings may be possible for some people.
Read more about this topic: Rook (piercing)