We report a solitary mastocytoma with a recurrent tense bulla on the p
alm of a 4-month-old male infant. Histologically there were numerous m
ast cells infiltrating the dermis. The bulla subsided without treatmen
t in 2 weeks, remaining an oval reddish patch. The present case shows
that solitary mastocytoma can occur on the palm, but to our knowledge,
this site is unusual.