7 Early Signs of Seborrheic Keratosis You Should Watch For
Beyond the internal “biological clock” of the skin, external and systemic factors may influence where and how a sebo keratosis manifests.
Cumulative Sun Exposure: The relationship between UV radiation and seborrheic keratosis is complex. While they frequently appear on sun-exposed areas—leading to the label age spots keratosis—they also occur on skin that is habitually covered. This suggests that while UV light may act as a catalyst or trigger in genetically susceptible individuals, it is not the sole cause. This distinguishes them from actinic keratoses, which are caused entirely by sun damage and are precancerous.
Hormonal Fluctuations: Observations in clinical settings have shown that seborrheic kera may increase in size or number during periods of significant hormonal shifts. This is sometimes seen during pregnancy or in patients undergoing estrogen replacement therapy. In these instances, a previously stable growth may become a more visible or slightly irritated seborrheic keratosis.
While a seborrheic keratosis is harmless 99% of the time, there is a rare clinical phenomenon known as the sign of Leser-Trélat. This involves the sudden, explosive eruption of many new lesions over a very short period (weeks or months).
This sudden proliferation can be a “paraneoplastic syndrome,” serving as a cutaneous warning sign of an underlying internal malignancy, most commonly a gastrointestinal adenocarcinoma. If you experience a rapid “shower” of new growths, especially if they are accompanied by an inflamed keratosis texture or itching, it is vital to seek an immediate medical evaluation.
