Boils are typically caused by Staphylococcus aureus bacteria, although they may be caused by other bacteria or fungi present on the skin surface. In addition to affecting the hair follicle, infections that cause boils will also typically involve the surrounding skin.
After an exhaustive search of my library I find no mention anywhere of any reference to moth as an omen or symbol of any kind. I will continue to look. Found this The moth is a symbol of sensitivity and impulsiveness, in dreams it can mean impending danger, and has traditionally been associated with psychic powers and their development. And of course like butterflies, they represent transformation. Apparently they're an omen of death in some cultures too.
A moth is an insect closely related to the butterfly. The reality is that butterflies are a small group that arose from within the moths. Most species of moth are nocturnal (which means they are active at night), but not all.