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3.how often can you use the auto micro needle pen? we recommend using the auto micro needle pen once or twice a week on the same skin area or you can do another treatment just after your skin recovering from the last time treatment,or you can ask your cosmetologist for advice depending on special individuals. 4.caution 1)for every auto micro needle pen needles,it is more better to be used for 10-30 times 2)do not share auto micro needle pen needles with other person. 3)do not use too much more than indicated times.if treated skin shows hypersensitive response, do consult with your doctor.