No one knows the answer. Although, a mole that is determined to be nodular melanoma skips the usual biological growth phases and can progress faster to the next stage. Seems everyone is different and each melanoma may have its own special growth factor. But catching it early is always the best practice and skin exams by you and your partner are optimal! See our melanoma skin exam that takes two minutes here: http://melanomainternational.org/melanoma-facts/examine-your-skin/#