There are many reasons for long nipples, which are analyzed as follows:1. Physical developmental reasons, if both nipples are longer and more prominent, and the difference between the two sides is not big, it is very likely to be physiological, no need to worry about it and do not need to be dealt with.2. Underwear is too tight resulting in red, swollen and larger nipples, which appear to be longer, and replacement of the underwear with more comfortable ones will be fine.3. Breasts are bumped or injured, which results in the nipples becoming enlarged.4. Allergies, exposure to Allergic clothing which makes nipple red and swollen, will be accompanied by breast skin redness, itching, sometimes there will be the formation of red rashes. 5, breast disease, such as breast duct hyperplasia or breast tumor produced by the lump, the breast top up so that the nipple appears long, there will be breast skin changes, if it is breast cancer, the skin will turn into an orange peel. However, in order to prevent missing the condition, nipples become long don’t deal with it on your own, go to the regular hospital for consultation.