4.5cm Ovarian Cyst

I posted a couple of months ago regarding prolonged monthly bleeding. Since then I have had 2 pelvic ultrsounds and CIN blood test. My initial unltrasound (done privately as I was very worried and didn't want to wait 6 weeks) showed a few small fibroids, bulky uterus and 4.5cm cyst on one ovary. The sonographer said cyst would most likely disappear but get it checked at 6 weeks and put forward CIN blood test.

CIN came back within normal range (went back to NHS at this point).  Had to hand over my private ultrasound report to my GP as nothing had been sent onto them. Had NHS ultrasound yesterday, sonographer had no information on previous ultrasound so told her what I was told.

Basically same result but cyst has been classed as a dermoid rather than something that could disappear on its own which has got me panicked. Sonographer said I would be passed to gynocologist for fibroid treatment but didn't seem concerned about cyst.

I don't have any discomfort with cyst and initially went to GP as periods were lasting around 10 days and heavier.  I am 44 and thought it was hormonal. I had a polyp removed on cervix recently (although when I had smear done recently GP said there was a small part left). Smear came back with no HPV.

Question - should I be worried about cyst? 

Grateful for anyone's experiences xx