Read the following passage and answer the question. My skin turned pink, then red, then brown. The flesh upon my hands broke first into oozing, running sores, then metamorphosed into a new rough hide—all as promised.

Excerpts from The True Confessions of Charlotte Doyle, copyright © 1990 by Avi. Used by permission of Brandt and Hochman Literary Agents, Inc. All rights reserved.

Based on its context, what does the word metamorphosed mean?

remained
changed
continued
stopped