A spray of perfume on the neck is a familiar final step before leaving the house. But a viral Instagram post by a cancer specialist has singled out the neck as an area “worth thinking about” because it lies close to the thyroid gland.

The caption says there is no evidence that spraying perfume on the neck damages the thyroid. Yet its references to hormone disruption and lifelong chemical exposure through thin skin may suggest a possible link with thyroid disease or cancer. Could a quick spritz really pose a special risk?

Current evidence does not show that applying perfume over the thyroid selectively delivers fragrance chemicals to the gland or exposes it to a higher dose than spraying elsewhere. Research on skin absorption and the anatomy of the neck do not support the idea of a direct, selective route to the thyroid.

The thyroid is a butterfly-shaped gland in the lower front of the neck. It releases hormones that help control how the body uses energy and sits beneath the skin and several layers of connective tissue and muscle.

What happens when perfume reaches the skin?

Skin acts as a barrier. An ingredient may evaporate, remain on the surface, enter the skin’s layers or reach the bloodstream. Absorption depends on the chemical, its mixture, skin condition and location, dose and contact time.

Body site can influence absorption. Once a chemical reaches blood vessels in the deeper skin, it can circulate more widely. Applying a substance near an organ does not automatically target that organ.

Safety assessments........

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