Im skinny but have random fatness under my jaw? how to i get rid of it?

im a skinny person, but i have this random fat under my jaw that makes me look like a bullfrog holding in hair, i would like to some how get rid of that very quickly and get my jawline and under i skinny and defined, but do not know for sure how. i heard its called "goose neck" can someone tell me how to correctly get rid of that, it looks retarded.