Squamous Cell Carcinoma in Llamas: Skin Cancer and Chronic Wounds

Squamous cell carcinoma, often shortened to SCC, is a cancer that starts in squamous cells. These are the flat cells that make up much of the outer skin and some mucosal surfaces. In llamas, SCC is uncommon overall, but it is important because it can look like a wound that never heals rather than a classic lump.

In camelids, these tumors may develop on the skin, around the eyelids, lips, nose, ears, or in areas of chronic irritation. A published llama case report also described SCC arising from a long-standing scar after trauma, which supports the concern that a chronic wound in a llama should not be dismissed if it keeps recurring or worsening.

SCC often behaves as a locally invasive cancer first. That means it tends to destroy nearby tissue before it spreads farther away. Some tumors stay fairly localized for a time, while others invade deeply or spread to regional lymph nodes. Because of that range, your vet usually recommends confirming the diagnosis with a biopsy before making a treatment plan.

There is not one single cause of SCC. In most species, this cancer is linked to a mix of DNA damage, chronic inflammation, and local tissue injury. Veterinary references consistently note that squamous cell tumors are more likely to develop in areas with less protective pigment and in skin exposed to ultraviolet light.

For llamas, the most practical risk factors to discuss with your vet are sun exposure, especially on lightly pigmented or sparsely haired skin, and chronic wounds or scars that never fully resolve. A published case report in a llama documented SCC developing from a traumatic scar after a long period of failed healing, which is why persistent wounds should be rechecked instead of repeatedly treated as routine skin injuries.

Long-term irritation may also contribute. Recurrent trauma, rubbing, infection, or inflammation can keep tissue in a cycle of damage and repair. That does not mean every chronic wound becomes cancerous, but it does mean a wound that behaves abnormally should be sampled. Age may also play a role, since many SCC cases in animals are seen in mature or older patients.

Diagnosis starts with a careful physical exam and a close look at the lesion's location, size, depth, and how long it has been present. Your vet may also feel nearby lymph nodes and ask whether the area has been treated before, exposed to sun, or associated with an old injury.

A biopsy is the key test. Cytology from a needle sample can sometimes help, but skin tumors and chronic wounds often need a tissue biopsy so a pathologist can confirm whether the lesion is SCC, severe inflammation, granulation tissue, or another tumor type. In camelids, safe restraint, sedation, or anesthesia planning is part of the process, and Merck notes that sedation is commonly used when procedures would otherwise be stressful or unsafe.

If SCC is confirmed, staging may be recommended. Depending on the case, that can include bloodwork, lymph node sampling, and imaging such as radiographs or ultrasound to look for local invasion or spread. These steps help your vet discuss realistic treatment options, expected recovery, and whether local control is likely.

Not every case can be prevented, but you can lower risk by focusing on sun protection and wound follow-up. Llamas with lightly pigmented skin, thin hair coverage, or chronically irritated facial areas may benefit from more shade during peak sun hours. Pasture design matters here. Shade structures, shelters, and avoiding prolonged exposure in the brightest part of the day can help reduce UV stress on vulnerable skin.

Prompt wound care is also important. If your llama gets a cut, abrasion, or pressure sore, monitor it closely until it is fully healed. A lesion that keeps reopening, draining, or thickening should be rechecked instead of repeatedly treated at home. Chronic inflammation and scar tissue are not guaranteed to become cancer, but they are reasons to stay alert.

Routine hands-on checks can make a real difference. Look around the eyelids, lips, nose, ears, and any old scars when you do herd health checks. Early lesions are easier for your vet to biopsy and often easier to manage than large, invasive tumors.