[A prolonged diagnostic examination of anal fissure with complicating contact dermatitis].

The topical calcium channel blocker diltiazem gel is among the most frequently used medical treatments for anal fissures. A known side effect of diltiazem gel is contact dermatitis. This case report presents a 44-year-old woman, who was assessed by several different specialities, due to persistent perianal symptoms, while treated intermittently with diltiazem gel for an anal fissure. After 18 months, the patient was diagnosed with complicating allergic contact dermatitis caused by diltiazem gel.