Later on in life, I suspect a frightening incident. Easy to take out. They may come back if all the sources are not completely removed or if the person gets in a high stress situation, characteristic of virtually all therapeutic cures. Clearly seen with fingernail biters. An emotional upset at that time of the year.
Allergies are frequently seasonal.
Runny nose, teary eyes under certain circumstances as the subject relates at an unconscious level to the death of a pet. I had an employee allergic to her own hair, caused by the death of her doggie at about age 3 or 4. Very traumatic to kids. I've had grown men cry as I took them back in time to a similar event. Nothing to be ashamed of.