pipでインストールしたパッケージをアンインストールしたい

前提・実現したいこと

環境構築の初心者です。
パッケージ管理ツールpipでインストールしたFlaskをアンインストールしたいです。

発生している問題・エラーメッセージ

Exception:
Traceback (most recent call last):
  File "/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/shutil.py", line 563, in move
    os.rename(src, real_dst)
PermissionError: [Errno 13] Permission denied: '/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/site-packages/Flask-1.0.2.dist-info/INSTALLER' -> '/private/var/folders/fy/1w49jqt53q33f00nsdbjtgnc0000gn/T/pip-uninstall-ho0c6791/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/site-packages/Flask-1.0.2.dist-info/INSTALLER'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 143, in main
    status = self.run(options, args)
  File "/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/site-packages/pip/_internal/commands/uninstall.py", line 75, in run
    auto_confirm=options.yes, verbose=self.verbosity > 0,
  File "/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/site-packages/pip/_internal/req/req_install.py", line 683, in uninstall
    uninstalled_pathset.remove(auto_confirm, verbose)
  File "/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/site-packages/pip/_internal/req/req_uninstall.py", line 224, in remove
    renames(path, new_path)
  File "/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/site-packages/pip/_internal/utils/misc.py", line 280, in renames
    shutil.move(old, new)
  File "/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/shutil.py", line 578, in move
    os.unlink(src)
PermissionError: [Errno 13] Permission denied: '/Users/umegumitakahito/.pyenv/versions/3.7.2/lib/python3.7/site-packages/Flask-1.0.2.dist-info/INSTALLER'