My face is wider on one side than other.. i have noticed this for about 2-3 years now.. what could it be? you can see pictures in my profile

Irregular growth: Approximately 1 in 10 people have some type of irregular facial growth and development. For men, this can occur as late as 19-25 years of age.

Masseter muscle: Masseteric hypertrophy is a relatively uncommon, idiopathic condition that can occur unilaterally or bilaterally. Non-surgical modalities of treatment include tranquilizers or muscle relaxants, pain psychology (CBT) and injection of very small doses of botulinum toxin type A.