Lesions began as skin-colored papules and expand in size slowly.
An early squamous cell carcinoma that has evolved from an actinic keratosis. This lesion is slow growing and took years to develop.
The surface may accumulate dense scale. The scale may become thick and resemble a horn. These structures are called cutaneous horns.
Accumulation of scale on the surface produces a structure called a cutaneous horn
The most common sites of involvement are back of the hand, ears, non-hair bearing scalp and the lower lip.
An early squamous cell carcinoma on the back of the hand. The tumor was not very thick and had been growing slowly for three years.
Squamous cell carcinoma on the back of the hand. This thick tumor had been present for two years. There was no indication that it had spread to the lymph nodes.
Squamous cell carcinoma. Squamous cell carcinomas and basal cell carcinomas are frequently located in the relatively light protected area behind the ear.
Lesions on the lower lip came present as ulcers which undergo cycles of healing and bleeding. Squamous cell carcinoma has the ability to metastasize. Lesions on the ears and lower lips are at higher risk for metastasis.
Squamous cell carcinoma of the lower lip. This sun exposed surface is at risk for developing both actinic keratosis and squamous cell carcinoma. Examination with the fingers reveals a thick mass infiltrating into surrounding skin. These tumors are dangerous and metastasize early.
Squamous cell carcinoma can occur in most in the area. Lesions are seen in scars, ulcers and in the anal area and on the vulva.