The clinic door opens, letting your first patient of the day in.

You are pleasantly surprised to see Gabriela, a normally bubbly seven-year-old who goes to school with your daughter. She is accompanied by her mother, Mrs. Morales.

"Hi, doctor! My legs are real thick. I don't like them, they're not pretty anymore", says the little girl sulkily.

Her mother explains - "Her legs began to swell around a week ago. It was barely noticeable at first and I didn't think much of it--I mean, she's normally just so active. But it seems to have gotten much worse now. And this morning, I saw her eyes....I think they look a little puffy."