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.
frenÂ·uÂ·lum. n. pl. frenÂ·uÂ·la (-lÉ). 1. Anatomy A small frenum. 2. Entomology A bristly structure on the hind wings of certain moths and butterflies that holds the forewings and hind wings together during flight.