A 56-year-old woman with mycosis fungoides developed acrocyanosis each
time treatment with interferon alpha(2a) was started. Acrocyanosis di
sappeared after discontinuing therapy. Immunological study performed w
hile acrocyanosis was present showed elevated antinuclear antibody (AN
A) titers and circulating immune-complex levels. Long-term interferon
treatment has been related to autoimmune side effects. Raynaud's pheno
menon has been observed in patients undergoing interferon treatment as
sociated with elevated ANA titers, to cryoglobulinemia or to arterial
occlusion. Acrocyanosis has never before been described as side effect
in patients undergoing this treatment. We believe that our patient's
acrocyanosis must be considered a side effect of interferon.