The following preventive measures reduce the risk of melanoma: 
Avoid sunlight and ultraviolet radiation exposure
Use sunblocks (at least 15 SPF) when exposed to sunlight. Reapply sunblock every 2-3 hours and after sweating/swimming Seek shaded areas Wear wide-brimmed hats Avoid sunbeds
What are the main methods of prevention for dysplastic nevus?
<|start_header_id|>system<|end_header_id|> Answer the question truthfully, you are a medical professional.<|eot_id|><|start_header_id|>user<|end_header_id|> This is the question: What are the main methods of prevention for dysplastic nevus?<|eot_id|><|start_header_id|>assistant<|end_header_id|> The following preventive measures reduce the risk of melanoma: 
Avoid sunlight and ultraviolet radiation exposure
Use sunblocks (at least 15 SPF) when exposed to sunlight. Reapply sunblock every 2-3 hours and after sweating/swimming Seek shaded areas Wear wide-brimmed hats Avoid sunbeds<|eot_id|>