Basal cell carcinoma does not actually come and go, but it can look like it does. The tumor often bleeds after a minor bump, forms a scab, and then appears to heal over, only to open up again weeks or months later. This repeating cycle of scabbing and seeming recovery is one of the most common reasons people delay getting a suspicious spot checked. The cancer is present the entire time, slowly growing beneath the surface even when the skin looks like it has healed.
Why It Looks Like It Heals
Basal cell carcinoma grows extremely slowly. Research on head and neck tumors found an average volume doubling time of about 148 days, making it one of the slowest-growing solid tumors. Because of this pace, a BCC lesion can scab over and appear to resolve for months or even years without seeming to change size. The skin over the tumor may temporarily close, giving the impression of a healed wound, but the cancerous cells underneath remain and continue to expand.
Memorial Sloan Kettering Cancer Center specifically notes that a BCC spot can scab and heal over and over again for months or years, making it easy to dismiss as just a sore or a wound that won’t fully go away. That cycle is actually a hallmark of the disease, not a sign that it’s resolving on its own.
What Basal Cell Carcinoma Looks Like
The classic form appears as a shiny, pink or flesh-colored bump with a pearly or waxy quality. You may notice tiny blood vessels visible on its surface, which look like fine red lines branching across the lesion. As it grows, the center may break down and ulcerate, leaving a raised, rolled border around the edges, sometimes called a “rodent ulcer.”
Not all BCCs look like that, though, and some subtypes are especially easy to mistake for harmless conditions:
- Superficial BCC shows up as a flat, pink-to-red, scaly patch rather than a raised bump. It tends to appear on the shoulders, chest, or back, and can look remarkably similar to eczema or psoriasis. A key difference is that eczema and psoriasis usually affect multiple areas of the body and respond to topical treatments. A solitary scaly patch that doesn’t clear up with standard skin creams is suspicious for superficial BCC.
- Pigmented BCC contains brown or blue-black coloring, which can make it resemble a mole or even melanoma.
- Morpheaform BCC presents as a white or flesh-colored, firm area with poorly defined edges. It often looks like a scar, which makes it particularly easy to overlook.
The superficial type is the one most likely to create the “coming and going” illusion. Because it’s flat and scaly, it can flare, fade slightly, then reappear, mimicking an on-and-off rash. Any persistent solitary patch of what looks like eczema or psoriasis that doesn’t respond to treatment warrants a skin biopsy.
What Happens If You Ignore It
Because BCC rarely spreads to distant organs, people sometimes assume a spot that keeps healing on its own isn’t dangerous. The real risk is local destruction. Left untreated, basal cell carcinoma continues to invade the tissue around it. On the face, that can mean damage to the nose, eyelids, ears, or lips. Near the eye, it can threaten the orbit. On the scalp, it can eventually reach bone. The longer it grows unchecked, the more tissue needs to be removed during treatment, and the more complex reconstruction becomes.
The slow growth rate can work in your favor if you catch it early, but it also means you can lose years assuming a recurring sore is nothing serious.
How It’s Treated and How Often It Returns
Most basal cell carcinomas are treated with surgery, and the cure rates are high. Standard surgical excision, where the tumor is cut out with a margin of normal skin, has a five-year recurrence rate of about 5.2%. Mohs micrographic surgery, a more precise technique where the surgeon examines tissue layer by layer during the procedure, brings that down to roughly 3.2%. In practice, the difference between the two isn’t statistically significant, but Mohs is typically preferred for tumors on the face or in areas where preserving tissue matters.
Nonsurgical options exist for certain low-risk tumors. A prescription immune-stimulating cream can be used for superficial BCCs, but the five-year recurrence rate is considerably higher at 17.5%, compared to about 2.3% for surgical removal in the same study population. That’s a meaningful gap, so nonsurgical approaches are generally reserved for cases where surgery isn’t practical or the tumor is low-risk.
The Pattern That Should Prompt a Visit
The telltale sign is a sore that follows this cycle: it appears, bleeds easily (sometimes from something as minor as washing your face or toweling off), scabs over, seems to heal, then opens up again. This can repeat for months or years. A normal wound goes through that process once and stays healed. A spot that keeps reopening in the same location is behaving differently from a regular cut or scratch.
Other patterns worth paying attention to include a shiny bump that slowly enlarges over time, a flat reddish patch that persists in one spot and doesn’t respond to moisturizers or steroid creams, or a scar-like area that appeared without any injury you can remember. Any of these, especially on sun-exposed skin like the face, ears, neck, or forearms, warrants evaluation. A dermatologist can often identify BCC visually using dermoscopy, a magnification tool that reveals characteristic branching blood vessel patterns invisible to the naked eye. A skin biopsy confirms the diagnosis.