DEFICIENCY !
White marks on nails. .
It can be a sign of low oxygen in your blood and is associated with lung disease. Clubbing can also be related to liver or kidney disease, heart disease, inflammatory bowel disease.
Small white spots on your nails are usually the result of nail trauma

What can cause dry skin..
A vitamin C deficiency causes scurvy, which is first manifested as rough dry skin and corkscrew hair growth. Inadequate vitamin C is also known to contribute to the development of the common problem of hyperkeratosis pillaris, as the follicles become damaged when collagen formation is impaired. DorrisWedding non white color items for wedding

Thyroid problems can cause nail problems ..
Liver disease can damage nails. Thyroid diseases such as hyperthyroidism or hypothyroidism may cause brittle nails or splitting of the nail bed from the nail plate (onycholysis). Severe illness or surgery may cause horizontal depressions in the nails.