A series of potent and selective carboxamide TRPA1 antagonists were identified by a high throughput screen. Structure–activity relationship studies around this series are described, resulting in a highly potent example of the series. Pharmacokinetic and skin flux data are presented for this compound. Efficacy was observed in a topical cinnamaldehyde flare study, providing a topical proof of pharmacology for this mechanism. These data suggest TRPA1 antagonism could be a viable mechanism to treat topical conditions such as atopic dermatitis.