Yeah, I'm not too fond of that either.
That is the bit that ties together the entire healing system and one of its biggest flaws that overshadows all else and makes it all look silly rather than just a bit over the top.
One of the reason I can't get behind any of the healing in 4th.
I have never, and will never use a Second Wind because I don't want to play a character that does that. I don't even keep track of my healing surges. I would rather my character die than mess with that crap.
If I want to play a healer, I will whip out a cleric.
It just isn't the way I see healing in D&D to belong and makes the powers like you mention seem silly when you have to ret-con the wound.
Sure it happened and you altered it. That was retconning the wound too quickly to even mention it.
If the heal comes form the fighter himself, then it is really funny where no magic can explain the wound being removed.
DM: You got another slash on your leg.
Fighter: I use Second Wind and heal....(More damage than the last attack caused)
DM: You notice the slash was only a leaf stuck to you as it floats away.
I mean bring back mending and bandages at least to make it look like there was a real wound until you go to sleep and turn into Naruto while dreaming.
*Naruto Uzamaki has great stamina and healing that from even the worst wounds to a point of near death he heals within a day or two. Slower than a 4th edition PC.