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Contact allergy to hydroperoxides of limonene and linalool

Author: Dr Ian Coulson, Consultant Dermatologist, East Lancashire NHS Trust, Lancashire UK. Copy edited by Gus Mitchell. October 2021.


What are hydroperoxides of limonene and linalool?

Limonene and linalool are fragrance chemicals extracted from the peel of citrus fruits (limonene) and herbs, flowers, and woods (linalool).

Limonene and linalool are themselves occasional contact sensitisers. However, on exposure to oxygen in the air, both substances oxidise into hydroperoxides which are much more potent sensitisers. As such, limonene and linalool are an increasingly recognised source ofallergic contactdermatitis.

Where are hydroperoxides of limonene and linalool found?

  • Personal care products eg, shampoos, conditioners, moisturisers, deodorants, and cosmetic products
  • Household products eg, washing up liquids and detergents
  • Industrial products and processes

Those sensitised may tolerate newly opened products, but after a period of time after the pack has been opened, the parent fragrance oxidises which can cause an allergic dermatitis. Due to this delayed oxidisation, a freshly opened product that is used daily at home may not cause problems, but an identical older opened product eg, those kept with holiday toiletries, may elicit a reaction.

Who gets contactallergyto hydroperoxides of limonene and linalool?

Ten percent of individuals investigated for a suspectedcontact dermatitis这些氢过氧化物被发现是过敏。Allergy was more common in women and those aged over 40 years.

What are the features of contact allergy to hydroperoxides of limonene and linalool?

Sensitised individuals willdevelopcontact dermatitison exposure to the hydroperoxides wherever there has been skin contact, such as where the personal care product has been applied to the skin.

  • Commonly affected sites include:
    • Theaxillae
    • Face
    • Trunk
    • Hands.
  • Therashis often:
    • Red
    • Swollen
    • Vesiclesand even blisters may develop.

How is contact allergy to hydroperoxides of limonene and linalool diagnosed?

Patchtestingconfirms the diagnosis — hydroperoxides are included in some of the standard patch test series. Those sensitised will develop a positive patch result; tests are read 48 and 96 hours after application of the过敏原to determine patch test reactions.

Patch testing details:

  • Hydroperoxides of limonene 0.3% in petrolatum
  • Hydroperoxides of linalool 1% in petrolatum.

How is contact allergy to hydroperoxides of limonene and linalool treated?

Offending products containing the hydroperoxides must be discontinued. Theeczemais treated by the application of atopicalsteroiduntil theallergic reactionsettles [seeAllergic contact dermatitis].

What should I do to avoid hydroperoxides of limonene and linalool?

  • Avoid products which contain the offending parent allergen (limonene or linalool)
    • Individualconstituentsare listed on the product label or insert.
    • Product manufacturers’ websites usually have a tab which reveals the list of individual constituents which is often easier to read than minimised print on the package label.
  • Useperfume- or fragrance-freeproducts as a safe alternative
    • “Parfum” is best avoided.


  • Dittmar D, Schuttelaar MLA. Contact sensitization to hydroperoxides of limonene and linalool: Results of consecutive patch testing and clinical relevance. Contact Dermatitis. 2019;80(2):101–9. doi:10.1111/cod.13137.PubMed Central
  • Karlberg AT, Shao LP, Nilsson U, Gafvert E, Nilsson JL. Hydroperoxides in oxidized d-limonene identified as potent contact allergens. Arch Dermatol Res. 1994;286(2):97–103.Journal
  • Moustafa D, Yu J. Contact allergy to hydroperoxides of limonene and linalool in a pediatric population. J Am Acad Dermatol. 2020;83(3):946–7. doi:10.1016/j.jaad.2020.01.048.Journal
  • Panico A, Serio F, Bagordo F, et al. Skin safety and health prevention: an overview of chemicals in cosmetic products. J Prev Med Hyg. 2019;60(1):E50–E7. doi:10.15167/2421-4248/jpmh2019.60.1.1080.Journal

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