What should you know about in situ squamous cell skin cancer?

In situ means the abnormal cells remain where they started, in the epidermis. The area may look like a rough, scaly, crusted, or persistently irritated patch, although appearance alone cannot confirm the diagnosis. A skin biopsy examines the cells and helps determine whether deeper invasion is present.

Sun exposure, immune suppression, previous skin cancers, and other factors can influence risk, but the reason for one lesion may not be clear. The diagnosis is not a statement that every unusual skin mark is cancer; it describes what the examined tissue showed.

Discuss the lesion's size, site, margins, and biopsy findings with a dermatologist or cancer specialist. Treatment may remove the area surgically, destroy or treat the surface in another way, or use radiotherapy when surgery is unsuitable or the location makes treatment planning more complex. Immunotherapy has a role in selected advanced skin cancers rather than every in situ lesion.

Do not pick, burn, or apply unapproved creams to the area. Protect the skin from ultraviolet exposure with shade, clothing, and suitable sunscreen, and examine the rest of your skin regularly. Keep follow-up visits because a treated area and other sun-exposed sites may need review.

Arrange prompt review if the lesion grows, repeatedly bleeds, becomes painful, develops an ulcer, or does not heal. After treatment, contact the clinic for spreading redness, pus, fever, uncontrolled bleeding, or rapidly increasing pain.

Did the biopsy show clear margins or any invasion? Which treatment suits the lesion's location and size? How will the treated skin look while healing? How often should my skin be examined, and which changes should prompt an earlier visit?