Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Request a prompt assessment for:
Follow-up plans vary.
A clinician may check whether the treated site has healed, review biopsy results, and look for persistent or recurrent abnormal skin.
People with multiple lesions, immune suppression, previous skin cancer, or extensive sun damage may need closer skin surveillance.
Arrange a routine appointment for a patch that persists, returns, or slowly changes.
Sun protection does not treat an existing lesion, so it should not replace follow-up or recommended care.
The article also says
Between appointments, check the treated area and the rest of the skin in good light.
A mirror or help from another person can make it easier to examine the back, scalp, and backs of the legs.
Sun protection may reduce further ultraviolet damage.
Useful measures include shade, protective clothing, a broad-spectrum sunscreen used according to its label, and avoiding tanning beds.
Every sign above is quoted from the sofidex article on Bowen's disease. If you are not sure, err upward — it is always reasonable to be checked.