Do I need professional medical help with this razor cut?

[Hayley]

Yes this is self harm, and save your lecturing because I'm not going to pay attention to it.
This cut is on my tricep and this all happened about 3 days ago, and it was the deepest razor cut I've ever done, so I'm a little freaked out in case it gets infected or anything. I've only now began to start washing it with warm water and letting it dry and then putting on antiseptic cream and putting a large band-aid on afterwards. (These are the only things I have in my house that can help).
The following are links to the photos of the cuts:

http://instagram.com/p/jve3RlxF3Z/
http://instagram.com/p/jve8y6xF3c/
http://instagram.com/p/jve_RiRF3e/

(They are different perspectives of the cut, just so you can get an idea of how deep it is).

Thanks.