Allergic contact dermatitis to diclofenac gel due to propylene glycol sensitization: usefulness of repeated open application tests to determine safer alternatives

Topical non-steroidal anti-inflammatory drugs (NSAIDs) can cause allergic contact dermatitis (ACD) and photocontact dermatitis. Although topical diclofenac is associated with fewer side effects than other topical NSAIDs, rare cases of contact dermatitis have been reported