What does it mean when a wound turns black?

Feb 07, 2023 Source: Cainiu Health

Dr. Li Feng

Introduction

Black discoloration of a wound may be caused by pigmentation, subcutaneous hematoma, or bacterial infection leading to necrosis. After tissue regeneration and repair are completed, the newly formed area may appear noticeably different in color compared to the surrounding skin, manifesting as hyperpigmentation. Subcutaneous hematoma mainly results from incomplete wound healing, causing local poor blood circulation and blood accumulation, which leads to darkening of the skin.

Black discoloration of a wound may be caused by pigmentation, subcutaneous hematoma, bacterial infection with necrosis, etc.

1. Pigmentation

After tissue regeneration and repair are completed, the affected area may appear noticeably different in color compared to the surrounding skin, indicating hyperpigmentation of the newly formed tissue. This condition generally does not require special treatment. Regular dressing changes and monitoring for signs of redness, swelling, or discharge are sufficient. As new tissue forms, the necrotic tissue will naturally slough off, and the wound's color will gradually return to normal.

2. Subcutaneous Hematoma

This mainly occurs when the wound has not fully healed, leading to poor local blood circulation and blood accumulation, resulting in black discoloration. For symptoms caused by this reason, medications that promote blood circulation and resolve blood stasis—such as Huoxue Zhitong Capsules or Sanqi Huoxue Tablets—may be taken under medical guidance.

3. Bacterial Infection with Necrosis

This commonly occurs when local wound healing is poor and infection is present. Local tissue becomes ischemic and necrotic due to infection, lacking arterial blood supply, causing cellular ischemia and coagulative necrosis. Additionally, bacterial reinfection may occur, producing pus. The wound appears black, with clearly defined borders and a dry surface. Besides discoloration, localized pain may be present, and in severe cases, systemic fever can develop. In such cases, antibiotic treatment should be administered under medical supervision, such as Amoxicillin Capsules, Norfloxacin Tablets, or Cefradine Tablets.

In addition, black discoloration may also result from improper surgical wound suturing that obstructs blood circulation. It is recommended to seek timely medical attention when wound blackening occurs. In cases of tissue necrosis, surgical removal of the dead tissue is necessary.

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