Over the years (probably 10) I have had a low grade "in situ" malignant melanoma removed from my neck and several squamous cell carcinomas removed from my face and one from my ear. Most recently (6 weeks ago) I had a Mohs surgery on the left side of my nose for an infiltrative basal cell carcinoma. I live at high altitude where UV light exposure is intense. Best advice is, of course, early intervention. Your skin tag almost certainly has nothing to do with UV light exposure so is likely unrelated to what set me up for my various cancers. Also, the fact that yours is a skin tag seems to bode well for a very successful surgery. It would be a more difficult surgery if the carcinoma was part of what is called the stroma of the tongue i.e. the body or substance of the tongue. Disclaimer....I am not giving out information as a MD but as a veterinary surgeon who has similar familiarity with tissue and cancers. Best of luck, but I don't think you will need that as I have a good feeling about your outcome.