It sounds as though it needs professional treatment. Can you not get to hospital by yourself, maybe get a bus or call a taxi or something?
I'm very sorry that your mum is treating you like that, it's one thing not to understand about self harm, to get angry and suchlike, but there is no excuse for refusing to get you basic medical treatment.
You should seriously get that cut sorted out though, it's not too late to try and minimise the damage, and dealing with it yourself is never going to be as effective as going to hospital.
Take care of yourself.
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