Welcome to the Dermatology Expert Forum.
There are quite a few differential diagnoses for perianal “lump”. Results of a biopsy combined with clinical manifestations should be sufficient to your dermatologist to establish the correct diagnosis.
Regarding your question about warts - they are caused by the human papillomavirus (HPV). There are more than 100 types of HPV. Different types of HPV cause different types of warts. Clinically, warts are usually small, flesh-colored, white, pink or tan, somewhat, not as smooth the touch as healthy skin.
Wishing You Optimal Heath,
Dr. Jasmina Jankicevic
Asymptomatic hyperkeratotic lesions on the anal region usually one of three causes :
1-skin tag ,
2-condyloma acumenata -------------- HPV
3- condyloma lata ------------------------- syphilis 2econdary stage
As an update: He described the condition as hyperkeratosis, and said it could be caused by multiple things, including possibly warts. Shouldn't warts be easily diagnosed by sight?