Hi there, following trauma to the cheek region, there is collection of blood within the cheek. This is called hematoma
. The inner part of the cheek called as buccal mucosa turns purple in color due to the blood within it. Owing to the swelling she would have difficulty in chewing and closing her mouth. The hematoma would resolve in 10 days time. As a prophylactic measure, we put the patient on a course of antibiotics. Regarding the clicking sound,it requires clinical evaluation. Consult a Oral and Maxillofacial Surgeon for the expert opinion and management.