Removal of the foreign body would be the first choice of treatment but in this case, I did not do it as I did not want the teacher to incur higher veterinary costs at the first consultation.

In such cases, surgical excision solves the itchy problem. The rabbit was put under general anaesthesia and operated. I did not recommend an e-collar as some rabbits just hate wearing them.

Maybe I ought to put on a bandage but the awkward location would not be easy for bandaging.  The wound healed because the foreign body had been excised. As to how this teacher's pet managed to be injured with a foreign body, it is a mystery to me as the rabbit has been very well cared for.  I guess, active young rabbits, like children, do get injured.

Many skin infections and wounds do heal with antibiotics and anti-inflammatory drugs. If they don't heal, then there is a high possibility of a "foreign body" under the skin. Sometimes it may be just better to get into surgery and get the pet "one" treatment once and for all. It may be penny wise, pound foolish to do otherwise!  Living is a marathon of learning from previous experiences to benefit future pet owners.