Yuck.. Where do boils come from?

It's a condition caused by a bacteria called staphylococcus aureus which is a part of our natural flora. Like a pimple, the bacteria is clogged and becomes overwhelmingly accumulated in an area where theres thick skin or damp/sweaty areas prone to friction. This usually happens during warm, humid climate. Tell your boyfriend to seek a physician and as much as possible stay away from the infected area especially if it has ruptured.