A lupus-like reaction to subcutaneous interferon-α at injection sites.

Interferon-α has been associated with a wide range of adverse events (AEs). A lupus-like reaction at the injection site of subcutaneous (SC) interferon-α is exceptionally rare. A 60-year-old woman with recurrent metastatic melanoma repeatedly developed cutaneous lupus-like reactions at the SC interferon-α-2b injection sites on her thighs. Known features of lupus-like reactions at SC interferon-α injection sites are reviewed, and cutaneous injection site reactions to SC interferon-α are summarized.