This happens due to severe dryness. The dried mucus of the nose causes itching. Apply a very small quantity of light moisturizing cream/lotion in the lower part of inside of nose every day, morning evening. Also after a bath blow out all the sticky mucus from the nostrils and wipe the nostrils with a soft tissue. Reapply moisturizer after the bath.
Otrivin is not recommended. If the problem is severe, take steam inhalation for 5 min and blow out the mucus gently. Aplly moisturizer.