I just found a hard movable superficial pea size lump on my 6 year olds chest over her ribs on the right side and was wondering what it up?

It's important to consult a pediatrician for an accurate diagnosis, as there are several potential causes for a hard movable lump in that area, such as a benign cyst, lipoma, or swollen lymph node. In many cases, these lumps are harmless, but it's essential to have a medical professional evaluate it to rule out any serious conditions. Keep an eye on any changes in size, pain, or other symptoms, and seek medical advice promptly.