Endometriosis after surgery, like LEEP or cone biopsy or even cesarean section, may be a possible complication. The difficulty is that it's hard to know what came first, the endometriosis or the surgery.
Years ago, endometriosis was not thought to be very common, but it may just not have been diagnosed. Women also tended to have children younger, and they had more children. Pregnancy is a good treatment for endometriosis because of the high progesterone. Menopause is a definite cure because estrogen drops.
The best estimates are that endometriosis affects about 20% of women today, in the worst cases causing severe pelvic pain and infertility. While symptoms can be a clue that a woman has it, to know for sure, you need lapropscopy where the doctor takes a look inside your abdomen. Some studies suggest that even more women have it and don't know it because they have few if any symptoms.
The misplaced endometrial tissue can cause the fallopian tubes to be distorted, making it hard for the tubes to pick up an egg, and the endometrial tissue can even grow on or inside the ovaries. Sometimes they call the endometriosis growing inside an ovary a "chocolate cyst."
A friend's wife had severe endometriosis, but they were able to conceive a daughter naturally. But when they wanted another child, they had to go to a reproductive endocrinologist. During egg retrieval, the doctor couldn't even get to one ovary due to the endometrial tissue that had grown over the ovary. They were naturally very disappointed that the doctor could only get 4 eggs, but she still got pregnant with twins! He recently commented that their house is very loud.
A woman with endometriosis may actually be quite fertile, but she may need some help to get the eggs where they can meet up with the sperm, which may be in a dish in a lab.
But back to endometriosis after surgery. There are some cases now that point to the possibility that surgery, like cesarean section, may cause endometriosis. Again, though, it's tough to know which came first.
This is not exactly what you want to hear when you are facing surgery, but don't let it stop you from getting the treatment you need. Just keep it in mind when you do try to conceive, and get to a specialist sooner rather than later if you don't get pregnant quickly.