Skin Tumors and Subcutaneous Lumps: Warning Signs, Biopsy, Surgery and Scars

What is a skin tumor or subcutaneous lump?

A lump may arise from the epidermis, dermis, hair follicle, fat, blood vessel, nerve, muscle or lymphatic tissue. It may also represent infection, inflammation or a post-traumatic collection. “A lump under the skin” is therefore a description, not a diagnosis. Surface photographs cannot show depth, firmness, mobility or attachment to fascia.

Common benign conditions

An epidermoid cyst is a keratin-filled lesion that may remain stable for years but can become red, painful, infected or rupture. A lipoma is often soft, mobile and slow growing. Nevi and other pigmented lesions are commonly benign but should be reviewed when asymmetry, border, color or evolution is concerning. Infantile hemangiomas may grow rapidly in early infancy and later involute; lesions near the eye, airway or other high-risk sites may need early treatment.

Warning signs

• Clear growth over weeks or months, or a sudden change after years of stability.
• A hard, fixed or poorly defined mass attached to deeper tissue.
• Repeated bleeding, crusting, ulceration or a wound that does not heal.
• Marked asymmetry, irregular border, mixed color or continuing evolution of a pigmented lesion.
• Persistent or night pain, numbness, weakness or impaired joint function.
• Fever, weight loss, night sweats or generalized lymph-node enlargement.
• Rapidly spreading redness, severe pain, fever or pus suggesting infection.

These signs do not prove malignancy, but they mean that observation from home is not enough. Airway, swallowing or vision compromise, uncontrolled bleeding, or severe infection requires emergency care.

What happens at the clinic?

The clinician asks when the lesion appeared, how quickly it changed, and whether it is painful, inflamed or bleeding. Examination considers size, surface, temperature, firmness, mobility, depth, pulsation and nearby lymph nodes. A typical superficial stable lesion may not need imaging. Ultrasound can help distinguish cystic from solid lesions, assess blood flow and show the relationship to deeper tissue. MRI or CT may be needed for a large, deep or complex mass.

Observation, biopsy or complete excision

A stable, asymptomatic lesion with typical benign features can sometimes be observed with dated photographs and measurements. Surgery may be considered for repeated infection, pain, bleeding, continuing growth, friction, functional compression, diagnostic uncertainty or a well-informed cosmetic concern.

A biopsy removes part of a lesion for diagnosis. Small superficial lesions may be completely excised and sent for pathology. A suspicious deep soft-tissue mass should not be removed casually without planning because the first biopsy route can affect later definitive surgery. Pathology determines the diagnosis and whether margins or additional treatment require attention.

Scars and recovery

Any incision produces a scar. Surgery can place and close the incision carefully, but cannot promise “no scar.” Scar appearance depends on location, skin tension, wound healing, infection, sun exposure and individual tendency toward hypertrophic scars or keloids. Silicone, tension-reduction tape and sun protection may be recommended after the wound has healed.

After surgery, follow wound and activity instructions and attend the pathology review. Seek earlier care for persistent bleeding, spreading redness, pus, fever, wound separation, rapidly worsening pain, numbness or reduced circulation.

Children and anesthesia

Local anesthesia may be suitable for an older cooperative child with a small superficial lesion. General anesthesia may be safer for young children, sensitive locations, deep masses or procedures requiring complete immobility. The surgical and anesthesia teams should decide together. Parents should not squeeze, puncture or apply unprescribed anesthetic products to the lesion.

References

• American Academy of Dermatology: ABCDEs of melanoma
• NHS: Lipoma