 Women who were using any other form of treatment for nipple trauma; use of any topical substance in the nipple-areola region; presence of inverted and pseudo-inverted nipple; presence of mastitis; previous history or presence of malignancies; presence of photosensitivity or any adverse reactions to exposure to sunlight; discharge planned for the first day of data collection; women under unfavorable psycho-affective and cognitive situations which prevented assessment of the analog pain scale, photo image record. and observation of breastfeeding; women who had twins, children with gestational age less than 37 weeks, or birth weight less than 2500 grams. 