Depending on the resolution you chose when creating the Unified Skin, you may have to fix some problematic areas, for example, the fingers. Let's do that quickly:
1. Step down to the lowest level of subdivision.
2. Correct the jaw and hands with the Move brush, as shown in the next image.
3. For the knees, use the Slash3 or Trim Hole brush to carve a thin line into the surface, where the muscles overlap.
4. Look out for other problematic areas, such as the armpits, and fix them, if necessary.
We just did some quick corrections to our Unified Skin of the creature. We have to find a good balance between a reasonable low resolution and the preservation of smaller details such as fingers or other parts close to each other when creating a Unified Skin. Thus, some corrections are always necessary.