I have an irregular mole (mum died melanoma) dermatologist said to keep an eye on it or they can remove. What do you suggest?

See below. You concern is understandable, however, vast majority of the moles do not become melanomas. You may watch the mole and if one becomes larger, irregular, changes color, develops a nodule, ulcerates or bleeds, see your doctor. Having it removed is another option if that would give you greater peace of mind.