Yesterday I went out to feed and take care of my six Rhode Island Red ladies and discovered some tiny black dots on their combs, so I though "frostbite". I heave read that if you put a small amount of Vaseline on their combs it can help prevent that, so I did very gently (and was surprised that they let me do that!) . I went out today and noticed that it looks like very faint black (almost like its inside the bright red comb) just where the triangles of their combs are.......I live in Iowa so winters just begun........I want to do all I can to get them through this first winter and would really appreciate any feedback!