What does a new lump or swelling feel like with Merkel cell carcinoma?

The bump may be smooth, shiny, dome-shaped, or raised above the surrounding skin. It can feel firm or rubbery and may enlarge over a short period. It often develops on sun-exposed skin such as the face, neck, arms, or legs, although other sites are possible. Pain, bleeding, crusting, or an open surface may develop as the skin changes.

A new skin bump can also be an insect bite, cyst, inflamed follicle, or another skin condition. Colour and texture alone cannot confirm Merkel Cell Carcinoma. A clinician may need to examine the whole area and nearby lymph nodes.

Book a prompt appointment for a new or changing bump, especially one that grows, changes colour, bleeds, crusts, or does not settle. Note its location, appearance, tenderness, and changes in size. Protect it from friction and sun exposure, and do not pick at the surface.

Assessment may include a skin examination and biopsy. The laboratory report helps identify the cells, while imaging or lymph-node evaluation may be considered if the clinician finds features that need further investigation.

Seek prompt review for fast enlargement, bleeding that does not stop with gentle pressure, increasing pain, spreading redness, or swelling near an eye, mouth, or airway. Urgent help is needed for trouble breathing, severe bleeding, or sudden facial swelling.

Ask whether the bump needs biopsy, how to care for the skin while waiting, whether nearby lymph nodes should be checked, and which changes should lead you to contact the clinic sooner.