Skin irritation and sensitisation: Some essential oils can cause skin irritation and sensitisation when applied topically. This can result in redness, itching, and even blistering. Essential oils should always be diluted before applying to the skin.

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Allergic reactions: Some people may be allergic to certain essential oils. Inhaling or applying these oils can cause allergic reactions, including swelling, hives, and difficulty breathing.

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Toxicity: Some essential oils can be toxic when ingested or absorbed into the skin in high concentrations. For example, camphor and wintergreen essential oils can be toxic if ingested in large quantities.

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Phototoxicity: Some essential oils can cause skin sensitivity and burning when exposed to sunlight or ultraviolet rays. This is known as phototoxicity and can be caused by essential oils such as bergamot, lime, and grapefruit.

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Interactions with medications: Essential oils can interact with some medications, including blood thinners, antidepressants, and chemotherapy drugs. It is important to talk to a healthcare provider before using essential oils if you are taking any medication.

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Misuse: Essential oils can be dangerous if misused. For example, some people may ingest essential oils or use them in aromatherapy without proper ventilation, which can cause respiratory problems.

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Overall, essential oils should be used with caution and under the guidance of a healthcare provider or certified aromatherapist. It is important to use high-quality, pure essential oils from reputable sources and to follow essential oil safety guidelines to prevent potential dangers.