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Soft Tissue Mass

Medically reviewed by Last updated on Dec 2, 2022.

A soft tissue mass is a lump or area of swelling under your skin. The lump may feel hard, soft, or painful. It may be found anywhere on your body. The cause of your lump may not be known. Common causes include injury, infection, or a benign (non-cancerous) tumor. Rarely, a soft tissue mass is a sign of cancer.


Follow up with your healthcare provider as directed:

You will need other tests to find the cause of your soft tissue mass. Write down your questions so you remember to ask them during your visits.

Return to the emergency department if:

  • Your mass suddenly gets bigger or changes color.
  • Your mass starts bleeding.
  • Your arm or leg closest to the mass is numb, tingling, or feels cold.

Contact your healthcare provider if:

  • You have a fever or chills.
  • Your mass is red, swollen, or draining pus.
  • Your mass is more painful.
  • You have new symptoms.
  • You have questions or concerns about your condition or care.

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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.