Strongly resembles squamous cell carcinoma but is benign. Within a few weeks, a tumor of 1 to 2 centimeters develops, round in shape with a central keratin plug. It disappears spontaneously within a few weeks.
Symptoms
A round, flesh-colored or red tumor develops within weeks. It can grow several centimeters and has a central keratin plug. It does not cause pain, itching, or bleeding. The tumor shrinks and disappears on its own within months, often leaving a scar.
Causes
A keratoacanthoma arises from hair follicle cells. Sun exposure likely plays a role. It appears mainly on sun-exposed areas such as the face, ears, arms, hands, and lower legs.
Diagnosis
Doctors recognize keratoacanthoma by its rapid growth and appearance. Since it resembles squamous cell carcinoma, a biopsy is often necessary.
Treatment
Although it usually resolves spontaneously, removal is often recommended due to its similarity to malignant tumors and the long resolution time. It is excised under local anesthesia.
Self-care tips
- Consult a doctor if a lump or sore does not disappear within a few weeks.
- Avoid excessive sun exposure.
Other
A keratoacanthoma is not contagious. In rare cases, it may recur in the same location.
