Achenbach Syndrome: An Atypical Presentation on the Left Hand

Achenbach syndrome is a benign condition of unknown etiology characterized by sudden onset bluish discoloration and bruising of one or more fingers without prior trauma, typically affecting the proximal phalanges on the dominant hand while sparing the nail bed and distal phalanges. It predominates in women, most often in their fifth decade of life, and is diagnosed clinically. This case presents a 59-year-old female patient with spontaneous painful pruritic bruising of her left middle finger, which spared the nail bed but not the fingertip. This case highlights an atypical presentation on the non-dominant hand involving the distal phalanx, which is typically spared. The course of the presentation lasted four days, at which point symptoms resolved. The patient reported taking aspirin for pain following the onset of symptoms with no improvement and denied previous occurrences of symptoms. Based on clinical presentation and symptoms, the patient was diagnosed with Achenbach syndrome. When the patient discovered Achenbach syndrome was benign, they denied consent for any diagnostic testing or imaging. The case aims to increase awareness and understanding of clinical variations of this condition by illustrating an unusual presentation on the non-dominant hand involving the distal phalanx so clinicians can ease patient anxiety and patients are not subjected to unnecessary testing or potential misdiagnosis.