Nail fungus — Comprehensive overview covers symptoms, treatment of this unsightly but manageable disorder.
http://www.mayoclinic.com/health/nail-fungus/DS00084

The American Academy of Dermatology is committed to advancing the science of medicine and surgery related to promoting a lifetime of healthier skin, hair and nails.
http://www.aad.org/public/publications/pamphlets/viral_mollscum.html