Macular amyloidosis: an assessment of prevalence, sex, and age.

Macular amyloidosis is a relatively common cutaneous disease in Asia and the Middle East. It is characterized by a reticulated or rippled pattern of pigmentation mostly in the upper back. This study was performed not only to determine the disease sex and age distribution, but also to evaluate its risk factors and the frequency among the dermatology clinic patients. Based on the clinical and random histopathologic findings, 100 macular amyloidosis patients were evaluated in a period of 3 years. Although the sex distribution (9 : 1, female : male ratio) differed dramatically from most of the previous reports, it was consistent with few other series. Eighty one percent of patients were between 21 and 50 years of age. The mean age of the female patients was higher than that of the males (difference of two means was 10.26 years and P = 0.027). Backscatching during bathing probably is not a common practice in Iran, therefore we could not consider this as a risk factor in our study. We found no evidence of any other associated risk factors.