How do cancereous lumps behind ear look like?

Swelling: Any type of unusual swelling or skin lesions with ulceration or continued growth in size should be evaluated by an otolaryngologist.

Various forms: Basal cell or squamous cell skin cancers can be very ulcerative and bleed often. Sometimes, basal cell lesions can be very nodular. This is something that should be seen by a dermatologist or ENT doctor. Many other things can cause bumps behind the ears.