Wavy Ridges also known as corrugations, long ridges that run either lengthwise or across the nail; some lengthwise ridges are normal in adult nails, and they increase with age; lengthwise ridges can also be caused by conditions such as psoriasis, poor circulation, and frostbite; ridges that run across the nail can be caused by conditions such as high fever, pregnancy, a zinc deficiency, and measles in childhood.
When we have a client with the following condition: corrugations (wavy ridges)
Signs and symptoms for corrugations (wavy ridges)
- Vertical ridges sometimes appear along the length of the fingernails

Description
Is corrugations (wavy ridges) contagious?
No, "corrugations (wavy ridges)" is NOT contagious!