The "hole" is her ear and perhaps it's draining fluid because of infection. Please get him to an avian vet!It would not be normal for that area to wet like that without receiving a misting shower or head due.
Likely an infection!
Recommend a visit to your Avian Vet, ASAP!
HiyaI agree with sailboat above. That wetness is definitely abnormal unless it's just had a bath or something