Subcutaneous Lesions, Lipoma, Cysts Etc.

Subcutaneous Lesions

Lipomas, Cysts, and Other Lumps Under the Skin

A subcutaneous lesion is a lump that sits just beneath the skin. Common causes include lipomas (benign fatty lumps) and cysts (often called “sebaceous” cysts, usually epidermoid cysts). Most are non-cancerous, but any new or changing lump should be assessed to confirm the most likely diagnosis and the safest management plan.

Common Scenarios We See

Case A: Soft, mobile lump that is slowly enlarging (often lipoma)

Typical features

• Soft or rubbery lump
• Often painless
• Moves slightly under the skin
• Slow growth over months/years

What this may mean

• Frequently consistent with a lipoma, but clinical assessment (and sometimes imaging) helps confirm this.

Case B: Firm lump that becomes tender, red, or intermittently drains (often cyst)

Typical features

• Firm lump under the skin, sometimes with a small surface opening (“punctum”)
• Episodes of inflammation (redness, pain, swelling)
• Occasionally discharge or infection

What this may mean

• Often consistent with an epidermoid cyst. If inflamed or infected, treatment may occur in stages.

What to Bring to Your Appointment

To streamline assessment and planning, please bring:

• Any prior ultrasound reports (and images if you have them)
• Any previous MRI / CT reports
• A list of medications, especially blood thinners (e.g., aspirin, clopidogrel, warfarin, DOACs)
• Photos if the lump changes (flare-ups, redness, discharge)

Imaging: What’s Usually Needed?

Ultrasound (often the first test)

Ultrasound is commonly used to assess:

• Size and depth
• Whether the lump looks cystic (fluid) vs solid
• Relationship to nearby structures

When MRI or CT may be required

Some lesions need additional imaging depending on complexity, such as:

• Deep lumps (near muscle or deep fascia)
• Lesions close to important structures (nerves/vessels)
• Large lesions or unclear diagnosis on exam/ultrasound
• Rapid growth or atypical features
• Difficult anatomical locations (e.g., groin, axilla, neck)

MRI is often best for soft tissue detail.
CT may be used in selected situations depending on location and clinical question.

Management Options

1) Observation (monitoring)

Suitable when the lesion appears benign, is small/stable, and not causing symptoms.

2) Surgical removal (excision)

Removal may be recommended when:

• The lump is growing or painful
• It interferes with movement, clothing, or work
• There are recurrent flare-ups (common with cysts)
• There is diagnostic uncertainty
• You prefer removal for comfort or cosmetic reasons

For cysts: complete removal of the cyst wall/capsule (when settled) reduces recurrence risk.

For lipomas: the aim is safe removal while protecting nearby structures.

Pathology: tissue is commonly sent for analysis to confirm the diagnosis, particularly if there is any uncertainty.

Procedure Details

Excision of Subcutaneous Lesions (Lipoma / Cyst / Skin Lump)

Below is a clear overview of what patients can expect before, during, and after removal of a subcutaneous lesion.

Before the Procedure

Pre-operative preparation

• Fasting: If sedation or a general anaesthetic is planned, you will need to fast. Our team will give you exact instructions (when to stop food, milk, and clear fluids).
• Medication review: Please bring an up-to-date list of all medications, including:
  • Prescription medications
  • Over-the-counter medications
  • Supplements (e.g., fish oil, vitamin E, herbal products)
• Blood thinners / anticoagulation: If you take blood-thinning medications, we will provide a tailored plan. Examples include:
  • Aspirin, clopidogrel (Plavix)
  • Warfarin
  • DOACs (apixaban, rivaroxaban, dabigatran)
  • Some supplements can also increase bleeding risk
    Do not stop these without specific instructions—we will advise what is safe for your situation.

Imaging and planning

• If available, please bring ultrasound / MRI / CT reports.
• Deeper or more complex lesions may require additional imaging for safe surgical planning.

Anaesthetic Options (How the Procedure Is Done)

Depending on lesion size, location, depth, and your preference/medical history, excision may be done under:

• Local anaesthetic (LA): the area is numbed; you are awake and comfortable.
• LA + sedation: relaxed and drowsy, often with minimal memory of the procedure
• General anaesthetic (GA): fully asleep (used for deeper, larger, or multiple lesions, or if clinically appropriate)

Your surgeon and anaesthetic team will recommend the safest option for you.

What Happens During the Operation (Step-by-step)

• The skin is cleaned with antiseptic and sterile drapes are applied.
• A planned incision is made over the lesion.
• The lesion is carefully removed:
  • Lipoma: removed from surrounding fatty tissue
  • Cyst: aim is to remove the cyst and its capsule/wall to reduce recurrence
• Bleeding is controlled, and the wound is closed (or managed differently if infection is present/ see below).

How the Skin Is Closed

Most commonly:

• Skin is closed using absorbable (dissolvable) sutures under the skin and/or absorbable skin stitches.

Sometimes:

• Non-dissolvable sutures are used, especially in areas under tension or where precise skin edge alignment is required. These will need removal (often 7–14 days, depending on body location).

When the Wound Is Left Open (Secondary Healing)

If the lesion is actively infected or the wound has a higher risk of infection, complete closure may not be appropriate.

In selected cases, part (or all) of the wound may be left to heal by secondary intention, meaning:

• The wound heals from the bottom upward
• Dressings are required
• Healing can take a few weeks, depending on size and location

This approach can reduce the chance of trapping infection under the skin.

Day Procedure and Going Home

This is usually a day procedure:

• You come in, have the procedure, recover briefly, then go home the same day.
• If you have sedation or GA:
  • You will need someone to drive you home
  • You should not drive, operate machinery, or sign legal documents for 24 hours

Aftercare (brief overview)

• Keep dressings as advised and follow wound-care instructions.
• Expect some bruising, swelling, and discomfort for a few days.
• You will be given guidance on:
  • Showering
  • Dressing changes
  • When to resume work/exercise
  • Follow-up timing and suture removal if required

Risks and Potential Complications

Most patients do well, but important risks include:

Common / expected

• Scar (inevitable, length depends on lesion size and access required)
• Bruising, swelling, discomfort
• Temporary firmness during healing

Less common

• Infection
• Bleeding or haematoma
• Wound healing issues (delayed healing, wound separation)
• Recurrence of the lump (higher for cysts if removed during inflammation or if capsule not fully removed)

Nerve-related risks (more relevant for deeper lesions)

• Sensory nerve irritation or injury → numbness/tingling around the scar or nearby skin
• Persistent sensory change can occur in a small number of cases
• Very rarely, for deep lesions near major nerves, motor nerve injury (weakness) is possible

Risk varies depending on depth, location, and proximity to nerves and vessels, this is where ultrasound/MRI/CT guidance can be important for planning.

When to Seek Urgent Review

Seek urgent medical review if you develop:

• Increasing redness, swelling, or severe pain
• Fever or feeling unwell
• Pus/discharge with worsening symptoms
• Sudden rapid enlargement or a hard fixed lump

Summary

Subcutaneous lesions such as lipomas and cysts are common and usually benign. Bringing any relevant imaging (especially ultrasound) helps confirm the diagnosis and plan management. Some lesions need MRI or CT depending on depth and complexity.

If surgery is needed, key considerations include scar, recurrence, and nerve injury risk (usually sensory, and very rarely motor for deeper structures).