What should you know about Bowen's disease?

Bowen's disease is also called squamous cell carcinoma in situ. It commonly appears as a slowly changing, clearly defined patch that may be red, pink, brown, or darker than nearby skin, with scale, crust, or surface thickening. It can occur on sun-exposed skin, but it may also develop elsewhere, including the lower legs or genital skin. Symptoms can be mild, and itching, tenderness, or occasional bleeding may occur.

A biopsy is often used when the appearance is uncertain. The result helps distinguish Bowen's disease from other scaly conditions and guides treatment. It is not the same as invasive squamous cell carcinoma, but untreated abnormal cells can extend deeper, which is why follow-up matters. [Sun-Damaged Skin](/conditions/photoaging/) can provide related context, while [Squamous Cell Carcinoma](/conditions/squamous-cell-carcinoma/) explains the invasive form.

Arrange a dermatology assessment for a patch that persists, enlarges, repeatedly crusts, or changes despite ordinary skin care. Do not try to burn, scrape, or remove it at home. Bring a list of medicines and describe how long the patch has been present, whether it has changed, and any previous skin cancers or immune-system treatment.

Treatment is chosen according to the lesion's size, depth, site, and your health. Options may include [Photodynamic Therapy](/treatments/laser-and-energy/photodynamic-therapy/), [Topical 5-Fluorouracil](/treatments/medical-dermatology/topical-5-fluorouracil/), [Cryotherapy (Lesion Removal)](/treatments/surgical-dermatology/cryotherapy-lesion-removal/), or a procedure that removes the abnormal area. Protecting skin from ultraviolet exposure helps reduce additional damage.

Book prompt medical review if a scaly or crusted patch is persistent or changing, particularly when it bleeds without clear injury, becomes painful, or develops an ulcer. Seek faster advice for rapid enlargement, marked tenderness, pus, or spreading redness. These signs do not identify the cause by themselves, but they mean the area should not be left unexamined.

Ask whether the area needs a biopsy, what the pathology result shows, which treatments fit its location, and how healing may look. Also ask whether another skin check is needed, how to monitor the site, and what changes should trigger an earlier appointment.