My daughter had bruising show up on her chin that is purplish-brown & covers from under her lower lip down from both corners of her mouth to underneath her chin. Just showed up yesterday & she said she didn t do anything. What would cause that & should I be alarmed enough to get it checked out right away?? My daughter will be 12 years old in September, is approx 41/2 ft tall & 120 lbs. She has asthma & allegies, was born a month early & spent 1 month in NICU for jaudice & related issues about 5 days after she was born. Gets 2 allergy shots every week, takes meds (advair, claritan, astelin, flonase, singulair, fluoxitine & multivitamins) & broke her wrist 6/26/11 with cast coming off 7/28/11.