All fingers on my 15 year old daughter's right hand is swollen for the past 3 weeks. no impact or trauma to the hand. may be because of the cold as it only appeared now in winter for the first time?

See a Dr.: One sided swelling of any extremity can be indicative of an underlying problem. (infection, vascular problem, lymphatic blockage, Thrombosis) You should take your child to see her Dr. A thorough history and exam can provide insight as to what the underlying cause could be and treatment. Unilateral swelling is not caused by cold weather.