it does get an immediate reaction from treatment providers, and generally an extreme reaction. Even if the damage is less than what would need to be done elsewhere on the body to get a similar reaction. Just the mention of the concept of self-harming there is seen as extreme. Most professionals consider it psychotic, even when in reaction to trauma... it's one of those "go directly to jail. do not pass go, do not collect $200" kinda things...
bdsm gets similar reactions from health care workers, especially if there is a history of any mental health issues. there's a lot of stigma and judgement around both, more-so that any self-harming behavior. if it is ever taken to an extreme form requiring medical attention in the least, they over-react and treat it as a mental health thing.
the taboos around sex are still very ingrained into society. anything that is different from the basic stuff is seen as deviant and a mental health issue much of the time. there are more conversations around bdsm since the popularity of 50 shades of grey, but overall it's still a really taboo topic... which sucks. it sucks more when you try to explain injury away as that, and they still don't get it... :/
had really good T's though, and they had not over-reacted to it, just other people (gyn, pdocs, er docs...). but they were all trauma T's, or worked closely with trauama T's. new T does not know yet, and I have no idea how she will react to it. dunno if I can talk to her about it.