Since all of the essential oils are photosensitive, experts recommend storing them in a location protected from direct sunlight. You should not apply oil of oregano to the skin and before going out when the sun shines in the summer because there is a danger of burns.
It is not recommended to use oil of oregano during pregnancy, as well as people who have idiosyncrasy of its components. During lactation, do not apply oil to the skin of the breast to the nipple.
Do not use oil of oregano after applying perspirant. The thing is that the combination of oil and sweat there is a danger of severe irritation of the skin. Light burning, which can last for 2 - 3 minutes after application of the oil is normal, so don’t worry about it. For other precautions you can learn to consult a specialist.