Sudden Painful Skin Swellings: Possible Causes and Solutions - Surgery

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Skin swelling and pain?


There is suddenly a lump under the chest that resembles a mosquito bite; it is not itchy but is painful.
It appeared suddenly before taking a shower that day.
Could this be a sebaceous cyst?

Ms. Zhang, 10~19 year old female. Ask Date: 2021/09/22

Dr. Chen Bingze reply Surgery


Hello, I'm not sure if there are any abnormalities in appearance.
It may still be necessary to visit the outpatient clinic for a general physical examination or an ultrasound to determine whether it is a solid tumor or a cyst.

Reply Date: 2021/09/22

More Info


Sudden painful skin swellings can be concerning and may arise from various underlying causes. Based on your description of a sudden swelling beneath the chest that resembles an insect bite, it is essential to consider several potential explanations.


Possible Causes
1. Allergic Reaction: One of the most common causes of sudden swelling is an allergic reaction. This could be due to something you came into contact with, such as a new soap, detergent, or even food. Allergic reactions can cause localized swelling, redness, and pain without itching.

2. Insect Bite or Sting: Although you mentioned it does not itch, it is still possible that the swelling is a reaction to an insect bite or sting. Sometimes, the body reacts to the venom or saliva of the insect, leading to localized pain and swelling.

3. Infection: An infection, such as cellulitis or an abscess, can also present as a sudden painful swelling. If the area becomes red, warm, or increasingly painful, it may indicate an infection that requires medical attention.

4. Cysts: A sebaceous cyst or other types of cysts can form under the skin and may become inflamed or infected, leading to sudden swelling and pain. These are usually benign but can cause discomfort.

5. Hematoma: If you have had any recent trauma or injury to the area, a hematoma (a localized collection of blood outside of blood vessels) could form, resulting in swelling and pain.

6. Dermatological Conditions: Conditions such as hives or angioedema can cause sudden swelling in various parts of the body. These conditions are often associated with allergic reactions but can also occur without a clear trigger.

7. Other Medical Conditions: Certain systemic conditions, such as vasculitis or autoimmune disorders, can cause sudden skin changes. These are less common but should be considered, especially if you have other symptoms.


Solutions and Recommendations
1. Observation: Monitor the swelling for any changes. If it resolves on its own within a few days, it may not be a cause for concern. However, if it persists, worsens, or is accompanied by other symptoms (such as fever, chills, or spreading redness), seek medical attention.

2. Cold Compress: Applying a cold compress to the swollen area can help reduce pain and swelling. This is particularly effective if the swelling is due to an insect bite or minor injury.

3. Over-the-Counter Medications: Nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or acetaminophen can help alleviate pain and reduce inflammation. Antihistamines may be beneficial if an allergic reaction is suspected.

4. Avoid Irritants: If you suspect an allergic reaction, try to identify and avoid potential triggers. This may include new skincare products, foods, or environmental factors.

5. Consult a Healthcare Professional: If the swelling does not improve, worsens, or is accompanied by other concerning symptoms, it is crucial to consult a healthcare provider. They may perform a physical examination, order tests, or refer you to a specialist if necessary.

6. Follow-Up: If you have a history of similar swellings or other skin conditions, keeping a record of these occurrences can be helpful for your healthcare provider in determining a diagnosis.

In conclusion, while sudden painful skin swellings can arise from various causes, careful observation and appropriate management are key. If you are ever in doubt, especially with new or worsening symptoms, do not hesitate to seek medical advice. Your health and well-being are paramount, and timely intervention can often lead to better outcomes.

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