Anonychiais the absence of fingernails and toenails. This can occur at birth (congenital anonychia) as a result of a mutation in a gene known as RSPO4. Acquired anonychia can be related tofrostbite,trauma, drug reactions, surgery, or circulatory disturbances.
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Ringworm is caused by a fungus.See AnswerHealth SolutionsFrom Our Sponsors
References
Jameson, J. Larry, et al.Harrison's Principles of Internal Medicine, 20th Ed.New York: McGraw-Hill Education, 2018.