How can I differentiate a boil & a herpe?

Herpes. Herpes is usually a grape like clusters ( multiple vesicular lesions) close to each other, where as a boil is a isolated lesion.
Boils vs herpes. A boil is usually an individual red painful bump, sometimes with a pustule on top. There may be several present on the skin at the same time. Herpes is a small group of vesicles filled with clear fluid or later pus that are surrounded by redness. When herpes heals, it leaves small crusts that eventually fall off. Boils can be caused by bacteria, acne, and other inflammatory conditions.