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I've tried using the thresholds (see this Q&A) skin_out = (H < 20) ^ (S > 48) ^ (V > 80), they should work better than those you are using. Of course with the dilate(5x5 window)-erode(5x5 window) afterwards, to join smaller patches. But the image you are showing is overexposed, so the Hue threshold is most likely failing in some parts, since the implementation in openCV yields a range [0..180}, you also will need to extend the Hue threshold to cover something like [170..180} ^ [0..20] or so.
