Peking with soft spot on bill

[Brenda22778]

Today I noticed my male Peking duck (about 4 months old) has a soft spot in the center of his bill ... it almost looks like it's rotting.
His brother's (a male roen also four months old) bill seems perfectly ok.

Both boys receive Niacin mixed in their feed and free range during the day. They are kept in the same pen at night with the same feed and water.

His activity level hasn't changed and he doesn't seem to be in any pain but I'd like to know if it's normal or something I should be concerned about.

 

[Alaskan]

Odd. ..

do you ever see him rubbing his bill on anything? Or does he try to stick his bill through the fence?

 

[Brenda22778]

Odd. ..

do you ever see him rubbing his bill on anything? Or does he try to stick his bill through the fence?

I haven't see him doing so ... I bought some vetrytrcin to rub on his bill just in case it's open enough for infection

 

[Alaskan]

is it the same now?