If the mole is large, thick, black or suppurative, you must see a doctor.
My grandmother used to have one, on the inner thigh. This mole is 20-30 years old. As flat as skin, no bulge, darker color and smaller area. It was nothing before, and I didn't pay attention. I started running inexplicably at the beginning of last year, and then I went to see a doctor. The doctor suggested cutting the mole, so he had a minor operation. There are signs of cancer after biopsy, but it will be fine after resection.
I have one on my back, too I was born with it. It is relatively small when it is born, and it becomes bigger when it grows up. It is about the size of the nail plate of the thumb, protruding from the skin and thicker. It has been nothing, but usually my mother tells me not to touch or dig, otherwise there may be problems. Because my mother met a patient in the hospital before, and she died because of the cancerous mole. So she is more concerned about my mole. This happened to my grandmother last year, and my mother was very worried, and then she asked me to see a doctor. The doctor said it was better to remove it, so I went for a minor operation. Soon, my back was locally anesthetized and it didn't hurt at all. Soon. Biopsy showed everything was normal. This mole has been with me for nearly 30 years. That is, after the operation, the wound scabs to get wet. Nothing else.
I suggest you see a doctor and see what the doctor says.