Things are rather plain in terms of Su-jok medicine:
--- itching is harmful "Dampness" energy
--- Yeast Infection
is also harmful Dampness
--- Depression is harmful Dryness energy
--- Dryness energy also controlls skin
If put this together, it explains the situation.
Looks like reproductive system the most vulnerable area where the itching developed.
Good specialist in Su-jok can treat all this by the same