database dynamic field(custom attribute)

Hi I have a table structure as

skills

id   
name

users

 id   
 name

and many to many relation

skill_user

skill_id   
user_id

different users will have different skill which they will select from skills table thats fine. My problem is that there will be few custom skills(custom attributes) that user will fill in a blank text box. How do i manage this kind of problem please help. I am doing this is php/Laravel/Mysql

via Chebli Mohamed