What should you know about melanoma in anus?

Anal melanoma develops from pigment-producing cells in the anal canal or nearby skin. It may appear as a dark or irregular patch, a nodule, bleeding, soreness, itching, or a change in bowel habits. These signs can also come from haemorrhoids, fissures, infection, or other growths, so a symptom does not by itself identify melanoma. A clinician may inspect the area, feel nearby lymph nodes, and arrange a biopsy. Tissue examination confirms the diagnosis and helps describe how deeply the tumour extends.

Further assessment may include scans and, in selected cases, a sentinel lymph node biopsy to look for spread through nearby lymphatic drainage. Treatment is tailored to the tumour's position, extent, and test results.

Arrange an appointment with a doctor promptly if you notice a new anal lump, persistent bleeding, or a changing dark mark. Do not scratch, cut, or apply wart or bleaching products to the area. Bring a list of medicines, note when the change began, and mention pain, discharge, bowel changes, or enlarged groin nodes. A specialist may discuss surgical excision or wider tumour removal, and immunotherapy may be considered when disease has spread or surgery is not enough.

Seek urgent medical help for heavy or ongoing bleeding, severe pain with inability to pass stool, faintness, fever, or rapidly increasing swelling. Arrange prompt outpatient assessment for any persistent bleeding or a new pigmented lesion, even when discomfort is mild. If melanoma is confirmed, follow the recommended staging and follow-up schedule; new headaches, weakness, confusion, or seizures need urgent assessment because they can signal serious illness, including brain metastases.

Ask whether the lesion needs a biopsy, what the pathology shows, whether imaging or lymph-node assessment is needed, and which treatment team will coordinate care. Ask how surgery could affect bowel function, wound healing, and daily activities, and which symptoms should trigger a faster review.