With the time of being in the army and cumulative sun-exposure period, the prevalence of tanning, photoaging and polymorphous light eruption increased, while the prevalence of sunburn decreased.
晒黑、多形性日光疹和光老化患病率随着执勤官兵高原入伍时间延长而增高，随着累积日照时数增多而增高；
2
Western medicine called it polymorphous light eruption.