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Hello,
Dear customer

Regarding what you mentioned, 

the average length of the fully erected penis is about 13cm , so in this case the man will not have any problem regarding the penile length.

What is a micro penis ?

This is when the penile length is less than 7 cm , so this will affect the sexual intercourse.

Is it possible to increase the penile length ?

There is no cream or medication which can increase the penile length.

What should you do in this case ?

 we recommend that you visit your urologist  doctor  so that the doctor could do a full clinical evaluation of your case in order to confirm that everything is going well.
Stay well.
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