Multiple epidermal inclusion cysts in a patient with rheumatoid arthritis: a case report

A construction worker with rheumatoid arthritis presented with multiple soft tissue masses on the volar surface of the palm and digits. A misdiagnosis of rheumatoid nodules was made secondary to the patient's history of rheumatoid arthritis. Subsequent excision confirmed multiple epidermal inclusion cysts, which was not entertained in the preoperative differential diagnosis. Follow-up evaluation 3 years later revealed no evidence of local recurrence. Based on our literature review, multiple epidermal inclusion cysts is a rare entity and has not been reported in a patient with rheumatoid arthritis.