arghghg what have i done?????

Thought id try ACV on my molluscms so soaked a cut up cotton wool pad and taped on over night, some stung a little and in the morning the first one i had (others seemed to spread from scratching) has a triangle of REALLY DARK BROWN PIGMENTATION all the others are fine and the surrounding skin is unaffected?? it isnt like other stories ive read where the skin is pink or burnt this is like really dark brown patchy pigments like dark freckles in a triangle of the shape of the cotton wool...i cant seem to add a photo i have tried
WHAT HAVE I DONE TO MY SKIN??? SHOULD I CONTINUE
IS IT ONLY ON THE FIRST ONE COS ITS DRAWN SOMETHING OUT VIRUS???
WHAT COULD THIS BE...NOW I HAVE SCAR AND MOLLUSC :(
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