If you are fair skinned and have been exposed to either extensive sunlight or sunbeds, then potentially you are possibly looking at a small melanoma which could be benign or malignant. A simple procedure under local anaesthetic will remove the black spot and it will then be tested. If it is malignant then youy may have to undergo a course of treatment but it is not somwething to be alarmed about at this stage, your GP will probably refer you to the local hospital quite quickley and you will sooon know the results, I would in the meantime try to avoid aggravating the area and avoid putting make up on it, also, stay away from sunbeds and don't stick pins in anything, weven if you sterilise it first, and tell your Mum i think her advice was a bit silly too.