Why do you look like a prune after a long bath?

After a long bath, your skin may look wrinkled or shriveled, similar to a prune, due to the absorption of water. When skin is submerged for an extended period, the outer layer, called the stratum corneum, absorbs water and expands. This expansion causes the skin to lose its smooth appearance and form wrinkles. This reaction is thought to be an evolutionary response that enhances grip in wet conditions.