Telling my Parrents I self harm?

So, i wear a hoodie a lot to cover my cuts and scars on my forearms, and they are geting suspicious, how do i tell them that i self harm and that i Dont want that stuff showing (additional info, currently im taking meds fro depression, actualy had my dose increased today, and Parrents want to hold off on counseling or therapy for a few months, and I'm just in a mess, and want them to realise how serious this is)
What should i do?
Telling my Parrents I self harm?
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