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.
Silkworm moth (Bombyx mori), lepidopteran whose caterpillar has been used in silk production (sericulture) for thousands of years. Although native to China, the silkworm has been introduced throughout the world and has undergone complete domestication, with the species no longer being found in the wild. 1  An adult silkworm has a wingspan of 40 to 50 mm (about 2 inches) and has a thick bristly body (the adult female is larger than the adult male). It typically is blond to light brown in colour, with thin dark bands running across the body. The wings are cream-coloured and have dark veins extending out to the margins.