The time interval between initial drug eruption and patch testing was not reported. In a 1998 study conducted by Barbaud and colleagues, [17] 72 patients (mean age, 52 years) underwent patch ...

A patch test only tests for contact allergens ... All of these reactions were delayed, meaning the signs of irritation showed up three to five days after my skin was exposed to them.

Dermatitis. 2007;18(2):63-77. Mayence and colleagues [23] also found a high frequency of positive patch-test reactions in a study of 11 patients (mean age, 51 years), most of whom had high drug ...