Wrote a lengthy response was almost done when the site deleted it. I don't think it's your internet I think this sites needing fixing. So you're going to get the condensed version. Basically I've taken care of humans with severe skin infection issues, chronic ones. You're not going to have normal feathers with that chronic inflammation/ infections / scabbing so this is what you need to manage. With that inflammation they'll get stuck. But not all ingrown hairs have infection so bacteria management is the root of the problem and keeping the skin calm is the goal. Some people have to bathe daily in chlorhexidine. I would bathe your chicken using an antimicrobial, in between bathing use an antimicrobial spray to knock down that bacteria count and give the pores a chance to heal. Chlorohexadine is unique in that it's anaerobic and aerobic meaning bacteria that survives without and with oxygen. That's all bacteria. I would never put mineral oil or any petroleum based product on skin. I don't even put it on my bamboo cutting boards. Think about where it's coming from. It doesn't belong in the body or on it. And then you have to ask yourself why? It does nothing to moisturize all it does is create a barrier. You've got bacteria and infection and all sorts of ick on the skin why would we want to trap it in. We don't. If you want to use something else on the skin to help soothe it I would go all natural, there are balms out there. Tea tree is great for managing skin infections. Mix it with something super gentle and soothing, whether you use an oil or balm. But the skin needs to breathe. Lots of things can piss off already pissed off skin, so just monitor anything topical to see if it's actually helping. I don't like that antibiotic ointment is petroleum based, but it is. Maybe that on a few super infected spots. But also if it is something like folliculitis a course of antibiotics. I cannot advise on which would be best for this chicken issue. Lastly I would recommend a chicken vet page on Facebook. Lots of chicken keepers and even some vets can give advice. Lots of brains wired to chicken problems there. There's Chicken Vet's Corner Chicken Talk 2.0 and Poultry Veterinary Advice. Lots of smart folks (and a few dummies) so read all the advice and do your own internet educating. And Good Luck! That poor sweet chicken girl, that is nasty and looks painful. Prayers for healing!