your speacialists basically saying : if the body was in the mode of repairing a wound there would be certain things that show up on a certain level in the blood .
thats true if the immune system works properly.
it still could be a wound or fungus bacteria or mites and all those things that need normal immune system in order to get rif of.
maybe if there isnt markers in the blood of immune response it can even Support the wound theory- if there isn't immune response the wound can never heal.
maybe they just looked for signs of immune system that shows up only if the immune system works well, maybe you can ask them which test you can do to know that your immune system is ok.