Unexplained Red Bumps on Abdomen: Causes and Solutions Explained - Dermatology

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Unusual redness and swelling on the abdomen?


Hello Doctor, about three to four days ago, I noticed some unexplained redness and swelling on my abdomen.
It looks similar to the marks left by flea bites or mosquito bites, with about six or seven spots clustered together.
However, they are not itchy; instead, they feel slightly painful.
Over the past few days, there have been signs of reduction in swelling, but they still sting.
If I press or touch them, it hurts, but there is no noticeable burning sensation.
Today, after the swelling has decreased, I took a closer look and noticed small black dots in the center of the redness.
I'm not sure if these are scabs from scratching in my sleep or something else.
I have searched for a lot of information but couldn't find symptoms like this.
Could you please help me understand what this might be? The original size of the redness was similar to a mosquito bite, and the current size has reduced to a diameter of about 0.2 to 0.3 centimeters.
Here are the photos: http://www.wretch.cc/album/show.php?i=papa8488&b=6&f=1539521126&p=0 http://www.wretch.cc/album/show.php?i=papa8488&b=6&f=1539521127&p=1

Xiao Cao, 20~29 year old female. Ask Date: 2010/04/12

Dr. Mao Mingya reply Dermatology


Hello, Xiaocao: The photo appears to show clustered blisters, which are commonly seen in conditions such as herpes.
Herpes includes both herpes simplex and herpes zoster.
Herpes simplex typically manifests locally around the mouth and genital area, but can also occur on other parts of the body.
Herpes zoster, on the other hand, presents as a band of clustered blisters usually on one side of the body, accompanied by sharp pain.
The symptoms tend to become more pronounced with age, as it is a reactivation of the varicella-zoster virus in the nerve ganglia.
Both conditions generally resolve on their own over time, and the main focus should be on preventing secondary infections.
However, if herpes zoster is particularly severe, it is advisable to consult a dermatologist for further management.
Changhua Hospital cares about you, Mao Mingya.

Reply Date: 2010/04/12

More Info


The appearance of unexplained red bumps on the abdomen can be concerning, especially when accompanied by symptoms such as pain or tenderness. Based on your description, there are several potential causes for these symptoms, and I will outline some possibilities along with recommendations for further action.

1. Insect Bites: The initial thought of flea or mosquito bites is plausible, especially if the bumps resemble typical bite marks. Insect bites can cause localized swelling, redness, and pain. The presence of black dots in the center of the bumps could indicate scabs from scratching, which can occur during sleep. If this is the case, the symptoms usually resolve on their own, but it is essential to avoid scratching to prevent secondary infections.

2. Allergic Reactions: Another possibility is an allergic reaction to something that has come into contact with your skin, such as a new detergent, soap, or fabric. Allergic reactions can manifest as red, itchy, and sometimes painful bumps. If you suspect this might be the case, consider any recent changes in your environment or products you have used.

3. Folliculitis: This condition occurs when hair follicles become inflamed, often due to infection or irritation. It can present as red bumps that may be painful or tender. If the bumps are near hair follicles, this could be a potential diagnosis.

4. Dermatitis: Contact dermatitis, which is a skin reaction to an irritant or allergen, could also cause similar symptoms. This condition typically presents with red, inflamed skin and can be itchy or painful.

5. Infections: Bacterial or viral infections can lead to localized skin reactions. If the bumps are warm to the touch, increasing in size, or accompanied by fever, it would be prudent to seek medical attention.

Given that the bumps have shown signs of reducing in size but still cause pain, it is advisable to monitor the situation closely. Here are some steps you can take:
- Avoid Scratching: As mentioned, scratching can lead to further irritation or infection. Keeping the area clean and avoiding irritants is crucial.

- Topical Treatments: Over-the-counter hydrocortisone cream may help reduce inflammation and itching. If you suspect an infection, topical antibiotic ointments can be applied, but consult a healthcare provider if symptoms worsen.

- Observation: Keep track of any changes in the bumps, including size, color, or the development of new symptoms. If they do not improve or worsen over the next few days, it would be wise to consult a healthcare professional.

- Seek Medical Advice: If the bumps persist, become increasingly painful, or if you develop additional symptoms such as fever or widespread rash, it is essential to see a doctor. A healthcare provider can perform a physical examination and may recommend further tests, such as a skin scraping or biopsy, to determine the exact cause.

In summary, while the symptoms you describe could be due to a variety of causes, including insect bites, allergic reactions, or infections, careful observation and appropriate self-care measures are essential. If there is no improvement or if symptoms escalate, seeking medical advice is the best course of action to ensure proper diagnosis and treatment.

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