As we age many of us (depending on our genetic composition) notice the growth of pigmented

or tan,waxy,rough skin growths which appear to be mostly on the surface of the skin or almost "stuck on."

These skin growths or lesions are called seborrheic keratoses.

                  In my practice I have seen patients with just one or two of these growths and patients with

literally dozens of them. And,when they ask me where they have come from,my answer is almost always:

"Momie and Daddie."

                And,research indicates that only about 1 % of this "benign" type undergoes malignant

transformation to a form of skin cancer-especially,the squamous cell carcinoma.

              However,the abrupt or sudden eruption of multiple seborrheic keratoses that rapidly increase

in size and number,often itchy, can be caused by an associated internal cancer-mostly a gastrointestinal

adenocarcinoma. This is called the sign of Leser-Trelat and is called a paraneoplastic syndrome

since  the skin manifestations of the multiple seborrheic keratoses is thought to be mediated by

hormones secreted by the internal cancer or by the body's immune response against the tumor.

              Although,some question that this abrupt or sudden onset of seborrheic keratoses is a sign of

internal cancer since seborrheic keratoses and cancer are common findings in the elderly anyway.

            In addition,it is encumbent on any clinician ,especially when examining a patient with

multiple seborrheic keratoses,not to do a cursory exam since a malignant  melanoma skin cancer(which can

look very much like a seborrheic keratosis) could be easily missed in such a patient.

          Again,the bottom line is to see your clinician for regular skin exams and especially if

you notice any change in size,color,shape or behavior of any skin lesion.