Ann:
Basically, you ought to have your daughter see a dermatologist or pediatrician, show the doctor all these areas, and then let yourself relax.
Cysts NEVER turn cancerous. Bumps are usually around the areola, and they are also NEVER precancerous. And all these changes are in the skin, and therefore have nothing to do with the breast.
I'm sure that one visit will put to rest all your anxieties.
Good luck.
Dr. R