A 5-year-old boy is brought to a pediatric clinic by his mother due to progressive swelling and redness near his left eye for the past three days. His mother states he had a similar, but milder, episode about six months ago that resolved with warm compresses. Currently, the swelling has worsened considerably, making him irritable, and he has developed a low-grade fever of 38.20C. Physical examination reveals marked erythema, tenderness, and a palpable tense swelling over the left medial canthus, extending slightly superiorly. His visual acuity is grossly intact, pupils are equally reactive, and he reports no pain with eye movements. His cranial nerves are otherwise grossly intact. Given the clinical presentation, what is the most likely diagnosis and the most appropriate initial management approach?

A 45-year-old female presents to an outpatient clinic complaining of persistent discomfort and swelling around her left eye. She reports that for the past five days, she has experienced increasing pain and redness near the inner corner of her left eye, accompanied by some tearing and occasional mucoid discharge. She denies any recent injury to the eye, significant vision changes, or difficulty moving her eye. Her medical history includes seasonal allergies managed with oral antihistamines and nasal corticosteroids. On examination, her temperature is 37.8°C, blood pressure 128/78 mmHg, pulse 80/min, and respirations 16/min. Physical examination reveals a localized, tender, erythematous, and warm swelling over the left medial canthus, just inferior to the eye. Mild pressure over the area elicits some reflux of mucopurulent material from the punctum. Cardiopulmonary and neurological exams are unremarkable. Considering this patient's presentation, what is the most likely underlying condition and the appropriate initial therapeutic approach?

A 6-year-old girl is brought to a regional medical center by her parents due to persistent tearing and redness in her left eye for the past 4 days, which has progressed to significant periocular swelling and discomfort. Her parents report she recently had a viral upper respiratory infection. On examination, she is afebrile with a temperature of 38.2°C (100.8°F), blood pressure 95/55 mmHg, heart rate 98/min, and respirations 20/min. Physical examination of the left eye reveals marked erythema, tenderness, and a firm, warm, exquisitely painful swelling over the medial canthus, inferior to the lacrimal sac. Gentle pressure on this area results in a gush of mucopurulent discharge from the punctum. The globe is not proptotic, ocular movements are full and pain-free, and pupillary responses are normal. Visual acuity is unaffected. The patient is otherwise alert and interactive. Given these findings, what is the most appropriate initial management strategy and a potential immediate complication to monitor for?