Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain sudden appearance of indentation below the cheek bone can be due to causes like traumatic
injury leading to loss of subcutaneous fat,scar shrinkage in the previous injury in the area, muscle spasm due to teeth grinding habit,
bug bite etc..
It needs to be evaluated clinically for ruling out the exact cause and treated accordingly..
You should consult an Oral Physician or an Oral and Maxillofacial surgeon and get evaluated and a proper examination and investigations like facial x rays can help in diagnosis and treatment can be done accordingly..
In case of muscle spasm, relaxing the muscles with the help of muscle relaxants as well as proper dental orthodontic appliances can help..
Loss of subcutaneous fat might need dermal fillers..
Other conditions can be treated as per the cause..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.