I need to make a part of a texture glow slightly.
Like Killer Crocs eyes (see image below)
[![enter image description here][1]][1]


[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/Vig4n.png
  [2]: https://i.sstatic.net/nI6F2.png

How do I do this?