What is and what could have caused a bump next to your nipple that resembles pimple or mosquito bite if you are not pregnant?

A bump next to the nipple that resembles a pimple or mosquito bite could be caused by several factors if you are not pregnant:

1. Montgomery Tubercles: These are small, raised glands located around the areola of the breast. They are part of the normal breast anatomy and can sometimes appear as bumps.

2. Skin Tag: A skin tag is a small, benign growth of skin that can occur on various body parts, including the breast. They are usually painless and harmless.

3. Sebaceous Cyst: A sebaceous cyst is a noncancerous growth that develops from a blocked oil gland. It can appear as a small, round, and firm bump on the skin and can sometimes occur near the nipple.

4. Allergic Reaction: If you have used a new soap, body wash, or other products that have come into contact with your breasts, it could cause an allergic reaction, leading to the development of a bump that resembles a pimple.

5. Hives (Urticaria): Hives are itchy, red, and swollen areas on the skin that can appear anywhere on the body, including near the nipple. They can be caused by allergic reactions, certain medications, or other triggers.

6. Insect Bites: If you have been bitten by an insect, such as a mosquito, in the area near your nipple, it can cause a small, itchy bump that may resemble a pimple or mosquito bite.

7. Infected Hair Follicle: An infection of a hair follicle, known as folliculitis, can also lead to the formation of a pimple-like bump on the breast.

It's important to note that some of these conditions may be more likely than others, depending on your individual circumstances. If you are concerned about a bump near your nipple, consulting with a healthcare professional for proper evaluation and diagnosis would be advisable. They can determine the exact cause of the bump and recommend appropriate treatment if necessary.