The Lloyd Dermatology and Laser Center
8060 Market Street, Youngstown, OH 44512
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Skin Cancer - Regression

Tumor regression in pigmented lesions is a most interesting phenomenon occurring in both benign and malignant lesions. It basically represents an immune response to a cellular process no longer considered or recognized as essential or desirable. Molecules of the "foreign" material are carried by dendritic macrophages to regional lymph nodes where killer T-cells are activated to destroy the unwanted substance.

As this process progresses, the pigmented lesion starts to regress both in substance and color. Over time the lesions may completely disappear leaving no evidence they ever existed. Examples abound for many of the pigmented melanocytic nevi found on children and young adolescents. This process can be quite dramatic clinically as in the case of halo nevi or the targetoid nevus or occur so subtly that the individual patient is completely unaware of the process.

Examples of targetoid nevi:

In the case of malignant melanomas, the process is usually partial with areas of the tumor undergoing regesssion with loss of substance and pigment while other areas of the tumor are expanding and increasing in tissue mass. It is important to recognizes areas of regression when present in these tumors clinically. Occasionally, all clinical evidence of the melanoma disappears except for a pigment smudge or faint surface irregularity or scar to mark its' original location. Metastases to lymph nodes or internal organs may be the first clinical evidence of the disease.

Examples of regression resulting in a "smudge" appearance:

Another useful clue to the presence of a melanoma is what I refer to as the Clearing Zone. It is a fairly well demarked area around the circumference of a melanoma in which the normal evidence of sun damaged skin (telangiectatic blood vessels, ephelides and lentigenes) has disappeared. When seen, it is presumptive evidence the lesion is malignant.

Examples of the clearing zone around melanomas:

Skin Cancer Resources:

Skin Cancer Overview

Malignant Melanomas
Amelanotic Melanomas
Regression of Melanomas
Basal Cell Carcinomas
Squamous Cell Carcinomas

MelaFind® Melanoma Detection

Are you at Risk?

The skin is the largest organ of the body. It is also our body's first line of defense. There are numerous factors which may increase your risk of skin cancer:

  • Genetics: The fair complexioned are at the greatest risk. Your risk is also increased if your parents, children, or siblings have had skin cancer.

  • Sun Exposure: Over the course of a lifetime, exposure to the sun can lead to a higher risk of skin cancer. Tanning beds and other "false sunlight" are no exception.

  • Immunosuppression: Immunosuppression therapy following organ transplants, chemotherapy, AIDS, and other treatments can put you at a significant risk for skin cancer.

  • Lifespan: Human life expectancy has increased from forty-two years in 1904 to close to eighty years today. As a result, the number of skin cancers being seen around the world is increasing.

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