Starting to wear varnish on toenails again after the winter, but have a soft flaky white patch on my R big toenail. Worse when nails have been painted. Not on any other toes. Is this a fungal thing? How to get rid? Don't want to have bare toes. Could put on a base coat, I suppose, which would help, but would rather get rid of it altogether. Any ideas of what may help? Thx.