(BMJ)—A man in his 70s who had no medical hx presented with a persistent, itchy, red rash on his trunk and extremities. The rash had been there for 2 months. Exam: concentric, raised, serpiginous bands with peeling. CBC: pancytopenia. Bone marrow bx: myelodysplastic syndrome. What is the rash?
Cutaneous lymphoma
Erythema gyratum repens
Subacute cutaneous lupus erythematosus
Tinea imbricata
Erythema annulare centrifugum
You are correct. The concentric, raised, serpiginous bands with skin peeling are typical of erythema gyratum repens, which has been described in only about 100 case reports. Roughly 70% of reported cases have been related to mainly solid cancers, but erythema gyratum repens can also occur in hematopoietic malignancy.

BMJ 2021;372:m4967