Hello,
From the symptoms there is very little possibility that it is a melanoma. It can be a cyst and moreover you have to keep an eye on the mole. Just look out for changes in the mole's/mark’s color, height, size or shape, you should have a dermatologist evaluate it. You also should have it checked if it bleeds, oozes, itches, appear scaly, or become tender or painful.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
The mole also has 3 dark lines near the bottom of it if you look close enough.