I agree with Deeli. You have to remove the mold before you can do anything else. Good luck.
Mold is nothing to mess with because it can affect your health! Since you say it is along a wall, that mold might also be in the sub-floor and inside the wall next to the area and mold spreads even after it appears to be completely dry. :-( It would be best to call two, three or four local mold removal experts for free estimate appointments to find out if this is serious and if so what needs to be done!
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