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Assalam o Alaikum, if Hemoglobin level of your father is OK, he should take Hijamah regularly, 250 ml of Hijamah blood drained after every 3 to 4 months.
And Hijamah at the back drains the most blood. I am hopeful to Allah that his allergy count will come down after Hijamah.
Stop all foods which trigger his allergy & itchiness, animal proteins, spices, pickles, hot natured foods, etc.