Basal vs Squamous Cell Carcinoma: How They Differ and What Comes Next
BCC and SCC are among the most common skin cancers, but their behavior and risk are not identical. This guide explains warning signs, biopsy and why site and risk features determine treatment.
Skin cancer · 11 min read · September 10, 2026
BCC and SCC are not the same diagnosis
Basal cell carcinoma usually grows slowly and only rarely spreads to distant sites, but untreated tumors can invade locally and damage surrounding tissue. Squamous cell carcinoma is also highly treatable when found early, yet selected tumors have a greater potential for deeper invasion or spread.
Those differences make tissue diagnosis and risk assessment important before treatment is selected.
How can they appear on the skin?
- BCC may appear as a shiny bump, sore-like lesion or rough area that grows slowly, bleeds, crusts and returns.
- SCC may appear as a rough scaly patch, a firm or dome-shaped growth, or a sore that does not heal and may bleed.
- Appearance alone cannot establish the diagnosis, and online photographs cannot rule skin cancer out.
A new persistent, changing, bleeding or non-healing lesion deserves direct assessment by a dermatologist.
From examination to biopsy
When skin cancer is suspected, the dermatologist examines the lesion and surrounding skin, takes the clinical history and may perform a biopsy so the diagnosis can be established microscopically. The pathology result then guides treatment according to tumor type, size, site, margins and patient risk factors.
Why is surgery common?
For many early skin cancers, surgery is a core treatment because it removes the tumor with an appropriate margin and provides tissue for assessment. The specific operation, the role of Mohs surgery or the use of selected non-surgical treatments depends on site, tumor type and risk rather than the procedure name alone.
Follow-up remains important after treatment because a history of one skin cancer increases the chance of developing another skin cancer later.
Medical Evidence
Medical review
This guide was written and medically reviewed by Dr. Yousef Abo Zarad, a German board-certified specialist in Dermatology and Venereology.