Two female patients had eruptions with the morphologic and histologic features of reticular erythematous mucinosis syndrome. However, both cases had features that differed from previous descriptions. In one case the eruption developed three to four weeks after a single erythemogenic sun exposure and faded after two to three weeks. The rash could be reproduced by exposure to ultraviolet B (UVB) or UVC radiation. In the other patient, the eruption involved the arms and face and spared the trunk, which is a more characteristic site of involvement; it was associated with a history of exacerbation following sun exposure, but the rash could not be reproduced on phototesting.