Becker's Nevus: Symptoms and Treatment Options - Dermatology

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Dark spots on the arm?


Hello doctor, I started noticing dark spots on my right arm when I was in elementary school, and there were long hairs growing on them (the hairs can be easily pulled out without any sensation).
Soon after, I began to develop raised bumps that resemble acne, which have spread to my back.
Could this be Becker's Nevus? Recently, lighter-colored areas have started to appear on the dark spots; it began as a small patch but has now spread.
Additionally, the bumps on the dark spots do not heal, and even if I scratch them, they will grow back.
Thank you.

Yan Chen, 10~19 year old female. Ask Date: 2016/07/03

Dr. Wu Yuxin reply Dermatology


It is possible, but without actually seeing the lesion, it cannot be confirmed.
If it is very concerning, please seek medical attention as soon as possible.

Reply Date: 2016/07/03

More Info


Becker's Nevus is a type of skin condition characterized by a large, pigmented birthmark that often appears during adolescence or early adulthood. It typically presents as a brownish or tan patch of skin, which may have an irregular shape and can be covered with coarse hair. The nevus can also develop small, raised bumps that resemble acne, and it may expand over time.
Based on your description, it is possible that what you are experiencing could be Becker's Nevus. The presence of a dark patch with hair growth, along with the development of raised bumps, aligns with the typical characteristics of this condition. The fact that the area has started to show lighter patches could indicate changes in pigmentation, which can occur in Becker's Nevus as it evolves.

Becker's Nevus is generally considered a benign condition, meaning it is not harmful and does not typically require treatment unless it causes discomfort or cosmetic concerns. However, it is essential to have a dermatologist evaluate your condition to confirm the diagnosis and rule out other skin issues, such as infections or other dermatological conditions that might mimic Becker's Nevus.

In terms of treatment options, if the nevus is asymptomatic and not causing any issues, many individuals choose to leave it untreated. However, if you are concerned about its appearance or if it becomes bothersome, there are several options available:
1. Laser Therapy: This can be used to reduce pigmentation and improve the appearance of the nevus. Various types of lasers can target the pigment in the skin without damaging surrounding tissues.

2. Surgical Excision: In some cases, if the nevus is particularly large or bothersome, surgical removal may be an option. This would involve excising the nevus and closing the wound with stitches.

3. Topical Treatments: While there are no specific topical treatments that can eliminate Becker's Nevus, some creams may help lighten the pigmentation. However, these should be used under the guidance of a dermatologist.

4. Monitoring: Regular check-ups with a dermatologist can help monitor any changes in the nevus. If there are significant changes in size, color, or texture, further evaluation may be necessary to rule out any potential complications.

It's also important to note that while Becker's Nevus itself is not harmful, any new or changing skin lesions should be evaluated by a healthcare professional to ensure they are not indicative of a more serious condition.
In conclusion, while your symptoms may suggest Becker's Nevus, a definitive diagnosis can only be made through a clinical examination by a dermatologist. If you are experiencing discomfort or have concerns about the appearance of the nevus, it is advisable to seek medical advice for appropriate management options.

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