Patch testing with the irritant sodium lauryl sulfate (SLS) is useful in interpreting weak reactions to contact allergens as allergic or irritant.
Contact Dermatitis. 2003 Feb;48(2):99-107. doi: 10.1034/j.1600-0536.2003.480209.x.
Contact Dermatitis. 2003.
PMID: 12694214