Then what do we tell Frisk when they see the over-heal burns or whatever? Since they are caused by healing that means Frisk will know you got hurt somehow and ask which person healed you.

Hey Flowey, do those over heal burns still hurt? Is there anything we can do to.. well.. at least erase the symptoms? What's wrong Flowey, why ARE you crying? Did we really make you THAT mad this time? 

(Red Anon) Don't tell me you remember that one!? Why do you remember? You always forgot in the past! How many times have we done this now, 8, more? And this is the one that stuck with him? THIS ONE? THIS ONE. OUT OF ALL OF THEM, OUT OF EVERYTHING, THIS ONE? I'M SO DONE WITH YOU.