Something is growing out a bull horn??
Answer:
Bull horns and fingernails are made of keratin, which is a protein, and nutritious for plants, which like nitrogen.
http://en.wikipedia.org/wiki/keratin...
says the athlete's foot and ringworm fungi live on keratin.
http://individual.utoronto.ca/jscott/ker...
is a technical paper, listing lots of possible culprits, and
how to test if they can really eat keratin.
http://www.hooked-on-nails.com/naildisor... shows
pictures and descriptions of several human finger/toe-nail problems.
(Googled fungi keratin animal horn)
You might try athletes foot or ringworm treatments, like lamasil AT.
http://en.wikipedia.org/wiki/list_of_fun...
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