Comb with red bits

[Cheryl lowe]

Hi, One of my chickens combs looks like this today ( another had it like this in winter and I thought it could be frostbite and put Vaseline on it and it went away ) but this can’t be cause in summer - any ideas?
Thanks

 

[The Happster]

Looks to me like she has been pecked.

 

[Cheryl lowe]

Thanks. No terrible disease so that good !