To answer your question: yes! you are at risk of developing anal cancer.
Risk factors with strong evidence include:
2. History of receptive anal intercourse
3. History of sexually transmitted disease
4. Multiple sexual partners (>10)
5. Previous cancers of the cervix, vagina, or vulva
6. Immunosuppression after solid-organ transplantation.
At young age its actually more common in homosexual males but above 35 years of age its more common in females.
Given you are at increased risk you should have your lump examined right away. That however, doesn't mean that your lump is necessarily anal cancer. On the contrary, a thrombosed hemorrhoid would be a much more likely possibility. It would also be associated with bleeding related to stools and constipation. Another possibility is a wart (HPV).
Please keep us updated and good luck!
Dr. Tamer Fouad, MD
MB, BCh, MSc Internal Medicine.
Consultant of Hematology - Oncology.