Dyes in diapers can cause skin rash

The dyes used to give diapers a fashionable flair may also give some babies and toddlers an allergic skin reaction, according to a new report.

In the September issue of the journal Pediatrics, they describe the cases of five children whose colorful diapers and training pants caused their skin to become red, itchy and inflamed. The babies and toddlers, who ranged in age from 9 months to 3 years, were all diagnosed with allergic Contact dermatitis - a reaction that arises when the skin comes in contact with an allergy-provoking substance, which in these cases appeared to be fabric dye.

All of the children improved after their parents switched to dye-free diapers.

Diaper rash is a common affliction of diaper wearers, but diaper dyes are a little recognized source of skin irritation, according to Dr. Karen Wiss of the University of Massachusetts Medical School in Worcester.

Contact dermatitis is an inflammation of the skin caused by direct contact with an irritating or allergy-causing substance (irritant or allergen) vary in the same individual over time. A history of any type of allergies increases the risk for this condition.

Irritant dermatitis, the most common type of contact dermatitis, involves inflammation resulting from contact with acids, alkaline materials such as soaps and detergents, solvents, or other chemicals. The reaction usually resembles a burn.
For more information check: Contact dermatitis

For parents, location is the best "best clue" to whether their baby's diaper rash is an allergic reaction to dye, Wiss told. If the skin irritation lines up with colored areas of the child's diaper, the dye may be to blame.
Diaper dermatitis - irritant-induced
Irritant-induced diaper dermatitis is a diaper rash caused by chemical irritants rather than bacterial or candidal infection. Common irritants include ammonia (produced when bacteria break down the urea in urine), acids in the stool (seen more frequently when diarrhea is present), and soaps and other products used in laundering cloth diapers.

For more information check: Diaper dermatitis - irritant-induced

In one of the cases Wiss and her colleagues describe, a 2-year-old boy developed hives underneath the blue-dyed waistband of his diaper. In another, a 9-month-old had a "well-demarcated" rash that matched up with the green-colored areas of his diaper.

Two of the children underwent skin testing that confirmed they had allergies to so-called disperse dyes. These dyes, which are used to color synthetic fibers like polyester, may release from fabrics in the presence of friction and sweating, Wiss and her colleagues note.