Solar keratosis pathology: how to understand the report

A pathology specimen is examined after a clinician removes part or all of a lesion. The report may describe thickening of the outer skin layer, atypical keratin-forming cells, and changes associated with ultraviolet damage. It may say actinic keratosis, or describe features that raise concern for squamous cell carcinoma. The wording should be interpreted with the examination findings because a small sample may not represent every part of a larger lesion. Broader [Sun-Damaged Skin](/conditions/photoaging/) can also be present around the sampled spot.

Ask the treating clinician to explain whether the lesion was fully removed, whether more treatment is needed, and whether other spots should be examined. Management can include observation, freezing, [Photodynamic Therapy](/treatments/laser-and-energy/photodynamic-therapy/), [Imiquimod Treatment](/treatments/medical-dermatology/imiquimod-therapy/), or [Topical 5-Fluorouracil](/treatments/medical-dermatology/topical-5-fluorouracil/). Protect exposed skin and keep the wound-care instructions supplied after sampling. If the report identifies cancer, the next discussion may involve [Squamous Cell Carcinoma](/conditions/squamous-cell-carcinoma/) care.

Contact the clinic if the biopsy site develops spreading redness, increasing warmth, pus, worsening pain, or bleeding that does not settle with firm pressure. Arrange review sooner if the original spot continues to thicken, becomes tender, repeatedly crusts, or fails to heal. These changes do not establish a diagnosis by themselves, but they warrant direct examination and may prompt further sampling.

What exact diagnosis does the report give? Was the sample complete, and are the edges clear? Does the wording suggest a need for another procedure or treatment? How should I monitor the area and protect the rest of my skin?