Since stage 0 melanoma is the very first stage of the cancer, there are several things you can do to prevent stage 0 melanoma. Because melanoma is related to sun exposure, you should limit the time you spend in the sun, especially during its strongest hours between 10 a.m. and 4 p.m. If you can't avoid sun exposure, make sure you wear sunscreen with a high sun protection factor (SPF) that blocks both UVA and UVB rays. It's also a good idea to protect skin by wearing a hat and clothing that covers your arms and legs. Avoid tanning beds, since they're a concentrated source of UVA rays. Also, make sure to check your skin often - everyone should look out for changes in moles and skin growths on their own body, but people at a high risk for melanoma should see a doctor for frequent skin screenings.