"Anak saya gatal karena alergi ikan."

Translation: My child is itchy because of a fish allergy.

[laviedulinguiste]

"My child is itching because of a fish allergy".

[joK8Un]

my child was itchy because he is allergic to fish...... should be accepted...if it is about meaning.

[joeldipops]

Should be "because of /a/ fish allergy"

[dkfour]

My child itches because of a fish allergy. (or "due to")