Really need opinions..my toddler keeps getting cysts.

Hi there, I'm really wanting some opinions on something. My daughter just turned 3 and she's always been a very healthy child. Around 2 1/2 she developed a lump on the palm of her hand where her ring finger meets her palm. Its very firm like a bone and grew from a tiny dot to a large mass. After 3 different doctors checked it out (her regular doctor, a dermatologist and a doctor at Arkansas Children's Hospital that specializes in "hands" lol) they determined it was a harmless ganglion cyst and that she should return in 6 months to see if it has grown, shrunk or dissappeared. He said it was common and that the tendon sheath can leak fluid forming a cyst. Also if its still there at her appointment then he will xray it to see it better and possibly remove it (i wish he would've done that first). Well she still has the cyst and tonight I think I've discovered yet another one under her knee cap. I just picked her up from my aunts house and as I'm undressing her to get ready for bath time I noticed a large lump and bruise. Upon inspecting it I noticed it has a center and I think I can feel a firm point kind of like the other one. I'm wondering if she's had this and I didn't notice because it's kind of deep and maybe she fell on it causing it to swell and bruise? I feel like it isn't normal for a toddler to keep developing cysts. Any thoughts?