Clear bumps on the nipple may be blisters, usually due to external stimulation, allergies, nipple inflammation. 1. External stimulation: usually wear tight clothes or uncomfortable underwear, can cause nipple friction stimulation, causing damage to the nipple skin blisters, but also may be accompanied by pain, itching and other symptoms. 2. Allergy: nipple allergy can also cause nipple blisters, which is usually caused by contact with allergic substances, and some patients will also be accompanied by local itching, pain, redness and swelling. 3. Nipple Inflammation: Nipple inflammation mostly occurs in breastfeeding women, due to the baby sucking on the nipple will cause nipple ulceration, triggering bacterial infection. It will cause redness and swelling of female nipples, high epidermal temperature, nipple pain and other symptoms, and when the symptoms are serious, it may cause blisters and pus in the nipple. There are many other causes of clear nipple bumps such as trauma, etc. It is recommended to consult a doctor in time to avoid blindly using medication on your own.