I Indonesia is one of countries that has a tropical climate, of course, has a lot of sunlight exposure. Beside sunlight’s function as a main source of energy for human lifes, it can also cause harm to humans, among others, it can have side effects on the skin when excessively exposed to sunlight. Melasma is a skin disease which can be caused by exposure to sunlight with the intensity of more than three hours a day. Causes of melasma beside due to the exposure to sunlight, it also can be caused by the use of hormonal contraceptives, one of which is a contraceptive pill. To reduce the incidence of melasma, it is necessary to conduct study aimed to determine the relationship between length of exposure to sunlight and the incidence of melasma in women who are taking the contraceptive pill. This research using observational analytic study with cross-sectional design that included 128 women in Pabuaran village RT 003 RW 016 Gunung Putri, Bogor. Data were collected by interview using questionnaire. Data analysis using SPSS for Windows version 17.0 and significance levels used as 0.05. Based on the statistical test of Chi-square, 76.56% of women who take contraceptive pill suffered from melasma were 65.63%, while those who do not take but suffered from it were 11.72%. A total of 42.97% of women exposed to sunlight for more than three hours suffered from melasma, while those exposed to sunlight less than three hours were 34.38%. There were 76.56% of women who take contraceptive pill suffered from melasma were 55.10% exposed to sunlight for more than three hours. It was found that there was significant association between duration of exposure to sunlight and the incidence of melasma in women who are taking oral contraceptives (p < 0,05). This study suggested that there was an association between the duration of exposure to sunlight and the incidence of melasma in women who are taking contraceptive pills.