can someone tell me what this is?

mckluckin

Hatching
5 Years
Apr 23, 2014
1
0
7
think it may be frostbite from this winter. Light went out for a day when wind chill was -30. Thought it was mud but its not. Dry and brittle feeling. Anything i can do now? Or will it just always be this way? Thought maybe fungus but other hen with smaller comb doesnt show and both act fine and healthy.
 
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