Sarah and the "lump"

My daughter noticed a lump on her arm a few days ago and complained about it and how it hurt. I told her what most Mom's would say.. it will be better in a couple days and if it isn't we will go to the Dr. Well, the Lump kept getting bigger and bigger so off we went to the Dr. yesterday. She was mystified about it, so she ordered an ultrasound of her arm. Turns out the lump which we named Herbert by the way, has 3 siblings... two are un-named but the largest is Matilda. She is twice the size of Herbert. Now I'm not trying to be silly or dismissive. I think naming these things is my way of coping with the fear that something is wrong with my daughter. We are waiting to hear back from the Dr. to find out what to do next... Here is a pic of Herbert anyhow.. please pray this is nothing serious!