Thanks for your question on Health Care Magic. I can understand your concern. By your history, description and ultrasound findings, possibility of dermoid cyst (benign) is more. And cancerous ovarian cyst is less likely. You are also having infertility. So possibility of PCOD (poly cystic ovarian disease) is also high. PCOD is commonly associated with hormonal imbalance. And this is the cause for infertility in it. So get done blood report for hormone levels and if they are abnormal than you need hormone therapy. It will reduce the size of the cyst and improves your infertility. But if your hormone levels are normal than possibility of dermoid cyst is more. And in this case, you need to get done surgical removal. So get done blood reports and discuss about these possibilities with your gynecologist. Hope I have solved your query. Wish you good health. Thanks.