Characteristic adverse skin reactions to antiseptic bath oils

Mignon Moyle, Elizabeth J Moore and George A Varigos
Med J Aust 2007; 186 (12): 652-653. || doi: 10.5694/j.1326-5377.2007.tb01087.x
Published online: 18 June 2007

Clinical records

Patient 1

A 6-month-old infant presented with eczema in January 2006 and was initially treated with antiseptic bath oil, emollients and topical corticosteroid ointments.

The infant presented again 3 weeks later with a 7–10-day history of groin and axillary desquamation. Brown hyperpigmentation and superficial brown desquamation were notable around the nappy area. Erythematous areas were noted in the skin folds (Figure A).

The infant’s mother reported using an antiseptic bath oil (containing 6% benzalkonium chloride, 2% triclosan, and 55.8% light liquid paraffin) up to three times a day in his bath. Emollient cream and low potency topical corticosteroid ointment had been applied to the nappy and axillary areas. The emollient cream and a high potency topical corticosteroid ointment had been applied to other unaffected areas.

Cessation of the antiseptic bath oil was recommended. The patient continued to use corticosteroid ointments, plain emollient bath oil, and 50% white soft paraffin with 50% liquid paraffin. Use of the emollient cream was later recommenced without problems.

Patient 2

A 7-year-old girl with moderate eczema developed a flare around her neck in February 2006. She had previously been educated on the use of bath oil in wet wraps and cool compresses for treating flares, and had started using the same antiseptic bath oil as Patient 1 (at the concentration recommended by the manufacturer for use as a rinse) in cool compresses. Eleven days after starting use of the cool compresses, she presented with a painful, weeping raw neck, upper chest (Figure B), back, and cubital fossae, requiring opioid analgesia and admission to hospital.

Her reddened weepy areas settled with cessation of the antiseptic bath oil, and use of plain bath oil, topical corticosteroid ointment, oral corticosteroid, and regular moisturising with 50% liquid paraffin and 50% white soft paraffin.

Patient 3

A 14-year-old girl with previously mild eczema presented in November 2006 with a flare affecting her cubital fossae. She was advised to use an antiseptic bath oil (containing 6% benzalkonium chloride, 2% triclosan, and 52.5% light liquid paraffin), emollients and potent topical corticosteroid ointment, and was given advice on using wet wraps to settle the affected areas.

Over a 10-day period, the patient’s eczema settled. She then acutely developed large bullae bilaterally in the cubital fossae, in a sharp “cut-off” distribution (Figure C). She could not fully extend her elbows due to the pain, and was admitted to hospital. Acute contact dermatitis was diagnosed, and use of the antiseptic bath oil was ceased. Her symptoms settled with the use of oral corticosteroid, frequent moisturising with 50% liquid paraffin and 50% white soft paraffin, and potent topical corticosteroid ointment.

Photographs of each patient at time of discharge, clockwise from below left:

A: Patient 1 — a 6-month-old infant with contact dermatitis from frequent bathing with antiseptic bath oil.

B: Patient 2 — a 7-year-old girl with contact dermatitis on her neck from using antiseptic bath oil in cool compresses.

C: Patient 3 — a 14-year-old girl with contact dermatitis on the cubital fossa from using antiseptic bath oil in wet wraps.

These three children all presented with acute contact dermatitis from use of antiseptic bath oil. The distribution of the reaction in each case suggested that cumulative irritant contact dermatitis was the likely cause. However, in all of these cases the reaction did not develop immediately, so allergic contact dermatitis was also a possible cause. Patch testing for an allergic cause was not undertaken in these children, as it was felt that this would not alter management in their acute care.

Ingredients in the two antiseptic bath oils used by these patients include benzalkonium chloride (6%), triclosan (2%), and paraffin. Direct contact with triclosan in formulated products has only rarely been associated with skin irritation or sensitisation in humans.1 Allergic contact dermatitis to benzalkonium chloride is also rare.2 Benzalkonium is a known strong cutaneous irritant and is reported to be corrosive to mucous membrane at a concentration of 10%.3

For Patient 1, the antiseptic bath oil was frequently being applied to his skin in the bathwater and not rinsed off. We believe that secondary occlusion to the groin (and axilla) by skin folds and the close fit of his nappy contributed to ongoing irritation. Prolonged contact with another bath oil with the same active ingredients in the same concentration has previously been reported to cause irritant dermatitis.3

Lessons from practice

  • Consider a diagnosis of acute contact dermatitis if brown hyperpigmentation and superficial desquamation complicate eczema, particularly if the patient is using an antiseptic bath oil.

  • Use antiseptic bath oils in a diluted concentration, not exceeding the manufacturer’s instructions.

  • If antiseptic bath oil is used, rinse off after use.

  • Use only plain bath oils for cool compresses and wet wraps.

It remains unclear whether the frequent application of cool compresses to the softer skin of the neck of Patient 2 resulted in irritant contact dermatitis, or whether true allergy developed. Similar eruptions have been described in reaction to standard concentrations of bath oil, as well as to concentrations greater than the manufacturer’s recommendations.3-6 However, the distribution in this case suggested irritant contact dermatitis.

The older child, Patient 3, stated that she had had marked initial improvement after starting use of the bath oil. Her mother thought that after this improvement there may have been a decrease in vigilance in measuring the concentration of the oil, as well as possible prolonged exposure time, which probably resulted in the subsequent acute burn seen in Figure C. A case has been previously described where an increased concentration of the same antiseptic bath oil caused subcorneal pustular dermatitis, with some features resembling a chemical burn, and restriction of movement.6

It is notable that, in all three cases, the thinner skin folds were preferentially affected. This has been previously described, when total body application of antiseptic bath oil to a 27-year-old man resulted in diffuse swelling of his penis and scrotum only.5

In view of the increasing frequency of use of these products, and the subsequent increase in incidence of contact dermatitis as a result (personal observation), we suggest that clinicians, nurses and pharmacists should be aware of the potential for this complication to occur. Using the appropriate concentration of antiseptic bath oils should be emphasised. We recommend that antiseptic bath oils be used only for rinse-off type applications, and, if used in the bath, we suggest rinsing after bathing. Furthermore, we strongly suggest that only plain bath oils should be used as part of a cool compress or wet wrap regimen.

  • Mignon Moyle1
  • Elizabeth J Moore1
  • George A Varigos1,2

  • 1 Dermatology Department, Royal Children’s Hospital, Melbourne, VIC.
  • 2 Royal Melbourne Hospital, Melbourne, VIC.


We wish to thank the other staff members of the dermatology team, and other staff members of the Royal Children’s Hospital for their contributions to the care of these children.

Competing interests:

None identified.

  • 1. Bhargava HN, Leonard PA. Triclosan: applications and safety. Am J Infect Control 1996; 24: 209-218.
  • 2. Basketter DA, Marriott M, Gilmour NJ, White IR. Strong irritants masquerading as skin allergens: the case of benzalkonium chloride. Contact Dermatitis 2004; 50: 213-217.
  • 3. Loo WJ, Alexandroff A, Burrows NP. Irritant dermatitis due to prolonged contact with Oilatum Plus®. Br J Dermatol 2003; 148: 171-172.
  • 4. Ling TC, Highet AS. Irritant reactions to an antiseptic bath emollient. J Dermatolog Treat 2000; 11: 263-267.
  • 5. Saw NK, Hindmarsh JR. Acute irritant reaction to an antiseptic bath emollient. Postgrad Med J 2005; 81: 131-132.
  • 6. Storer E, Koh KJ, Warren L. Severe contact dermatitis as a result of an antiseptic bath oil. Australas J Dermatol 2004; 45: 73-75.


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