Hello. Thanks for asking from HCM. I can understand your concern. It is good that you have almost recovered from injury. The accident and sudden airbag opening can cause injury over face or skull pressure over face tear of scalp or facial vessels, mostly veins sudden jerk can cause concussion or spine injury These complications can be ruled out by observing signs and symptoms : redness and swelling over face : black eye or bruise, pain : headache, visual blurring, short memory deficit, sometimes loss of consciousness : neck pain, tingling sensation in extremities, needle like pain sensation in neck radiating to extremities If you are having any of above signs or symptoms, you should consult ER. Meanwhile at home, you can : Apply icepacks at swelling site : Take painkiller like Diclofenac sodium after proper prescription. It also decreases swelling and redness : Keep your head at higher level than chest : Take bed rest : Avoid mental and physical stress for at least one week If still no relief, consult doctor. Hope it will help you. Take care. Thanks.