its a pressure sore/bed sore forming under the skin. It will emerge it from her constant sitting and sleeping sitting in one position for many many hours a day.I wonder what is really hurting her, because I don't think even Amber knows where her tailbone is located given how deformed she is by her blubber.
Pressure sores are sores on your skin. They’re usually caused by being in a bed or wheelchair nearly all the time. They’re also called bedsores.
Also that boutique owner is a jesus freak i wonder if she knows a filthy sinner is buying her clothes! LAWD!