Here is an illustration of White Icicle Rashes:

***Please see correction in next post***
These are a variety of Daikon Radish, which are also called Chinese Radish, Oriental Radish, Japanese Radish, or White Radish. "Daikon is thought to have originated in the Mediterranean. It reached Japan, by way of China, about 2,000 years ago. Today, more land in Japan is devoted to the cultivation of daikon than any other vegetable. In one form or another, daikon appears at almost every Japanese meal. Its name is derived from the Japanese words dai (large) and kon (root)." -from http://www.bigoven.com/glossary/Daikon
Sakurajima daikon is the world's largest variety of daikon, confirmed by the Guiness Book of World Records. The biggest can be as heavy as 99 pounds!