Beak is rotting

[chrisarvor]

I notice on my Yokohama hen she had what I thought was food dried on the side of her mouth
When I picked her up to clean it off the inside of her beak has rotted away
A terrible smell from the rot. All the inside of the beak has rotted to a powder

Apart from that she is healthy and in perfect condition

What is it and what can I do

 

[Eggcessive]

Can you post a picture? This sounds like it could be canker or trichmoniasis, a protozoan. It can be treated with metronidazole (Fish Zole, Flagyl) 250 mg orally for 5 days, if you think it could be that. Here is a good article on canker, and I will wait to see a picture:

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Oral Canker

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Oral Canker is a condition which can be found in a wide variety of birds and most commonly in pigeons.
Causes

It is caused by a motile protozoal parasite called Trichomonas gallinae.
This parasite can cause caseous lesions of the mouth, pharynx, oesophagus and in certain circumstances, further down the digestive tract. These lesions can become extremely extensive.
This causes the birds to stop eating and drinking, in severe cases the extensive nature of the lesions combined with not eating and drinking leads the chickens to die.
Diagnosis

Diagnosis is often based upon clinical signs but wet smears can be examined under the microscope to confirm clinical suspicions. Speak to your vet.

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Treatment

The treatment traditionally involved the use of a drug called Dimetridazole, however, this drug is no longer available or licensed for use in the UK.
The affected chicken in these photos was treated with Metronidazole, this is a UK licensed medication but is not used in poultry therefore it had to be prescribed under the rules of the Veterinary Medicines Directorate cascade. This also means that any eggs the chicken may lay during treatment and for a specified period after treatment would need to be discarded. Her eggs must never be sold for human consumption. The owner of the hen was extremely pleased with the outcome and has supplied us with plenty of photos to monitor the hen’s progress.