My first reaction was "Go to the vet", but I think, as harsh as it sounds, for the cost of one visit you can buy 100 more egg-laying dinosaurs... So, this only an option if the chicken has a big emotional value to you.

I think the best option is to buy both a desinfecting, and then use a wound-healing ointment, both from the pharmacy.
For disinfecting stuff, you can buy something based on iodine or silver for example. Do not use alcohol or stuff like that!
And for wound healing, you can use something based on panthenol, with a neutral carrier.

Keep her out of the sun, and treat + check her multiple times daily.

If that still doesn't help, consider antibiotics from the vet, but that will be way more expensive.

[–] Gnugit@aussie.zone 8 points 2 months ago

Ok, that sounds reasonable, thank you. I don't think she will be going to the vet unless my daughter decides she wants to help considerably with the bill as it's her hen.

I'll try your suggestion and see how it goes.