This can occur when certain essential oil constituents, particularly furanocoumarins, (natural chemicals found in particular essential oils) react when exposed to Ultraviolet UVA light.
Inflammation, blistering and reddening/burning of the skin are most common to occur.
Citrus oils, as a group, are generally considered to be phototoxic. However, not all citrus essential oils are phototoxic, and the method of extraction as you see in the picture below.
You should not use these essential oils in creams or lotions or lip balms that stay on your skin while you are in the sun.
Inflammation, blistering and reddening/burning of the skin are most common to occur.
Citrus oils, as a group, are generally considered to be phototoxic. However, not all citrus essential oils are phototoxic, and the method of extraction as you see in the picture below.
You should not use these essential oils in creams or lotions or lip balms that stay on your skin while you are in the sun.