Unusual Lump on My Arm
At 30 years old, I identify as a trans man and have been administering subcutaneous testosterone at a dosage of 0.4ml every week. Now, onto the matter at hand. To share a bit of background, I noticed this lump on my upper left bicep last April after engaging in self-harm by cutting. The lump is firm, and if it gets bumped, it becomes swollen, extremely painful, and exceedingly itchy. Recently, I observed that it started to expel what I suspect is pus—a white, odorless fluid without any visible signs of infection. Two small openings have formed; one is fairly insignificant and hasn’t released anything, while the other is more substantial and has drained fluid. This larger hole produced a white plug that was eventually expelled today, leaving a perforation in my arm. Although the lump is still somewhat present, it has changed. As an EMT, I possess some medical knowledge, but I haven’t sought professional help for various personal reasons. What might be happening with my arm? Any insights would be appreciated. Thank you!
Answers (1)
2/16/2026, 5:40:38 AM
OpenHealth AI
It sounds like you’re experiencing a lump on your arm that has become painful and has begun to drain fluid, which raises several concerns that deserve attention. Here's a breakdown of potential causes, what might be happening, and the immediate steps you can take.
Summary:
You have a firm lump on your upper arm that is painful, itchy, is exuding fluid, and has developed open areas. The history of self-harm might contribute to the situation, and the lump could indicate an infection, an abscess, or could relate to a reaction to the testosterone injections.
Explanation:
Given your description, several possibilities exist:
- Infection or Abscess: The fluid and swelling suggest there might be an infection, possibly from the self-harm or irritation from the testosterone injections. Abscesses can form when bacteria enter the skin.
- Cyst: A sebaceous or otherwise benign cyst can become inflamed or infected, leading to drainage of fluid.
- Reaction to Injection: If this is directly related to where you've administered testosterone, it might indicate an inflammatory reaction or localized infection.
Next Steps:
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Keep the Area Clean: Gently wash the affected area with mild soap and water twice daily to prevent bacteria from worsening the situation.
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Monitor Symptoms: Track any changes in size, color, or fluid from the lump. Watch for symptoms such as increased redness, warmth, fever, or more excessive fluid drainage.
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Manage Pain and Itchiness: Over-the-counter pain relievers like ibuprofen or acetaminophen can help with pain and reduce inflammation. Antihistamines may relieve itching if that symptom persists.
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Avoid Further Irritation: Do not apply any creams or ointments unless prescribed. Protect the area from bumps and avoid any self-manipulation.
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Prepare for Professional Evaluation: While you have personal reasons for not seeking medical help, this situation warrants professional evaluation. Note all your symptoms, including when they started and changes over time, to share with a healthcare professional.
Final Thought:
It’s understandable to have reservations about seeking care, but it’s important to prioritize your health. This lump can have complications if left untreated, especially if it indicates an infection. Taking these steps can help manage your symptoms while you prepare for a comprehensive evaluation. Your well-being is important, and addressing this could significantly improve your comfort and health.
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