Hi Ray,
I shared most of my good ideas already in this post, but I will add: if the wounds are fresh, the best thing you can do is take really good care of them and the skin around them to promote healing and minimize the chance of long-term, noticeable scarring. Every body is different, so I can't tell you how fast your skin will heal or whether you can 100% prevent scars or not, but if you haven't already, please check out this post for more info:
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2020/3/do-self-harm-scars-e…
You can also check these posts and see if you can find any more inspiration there:
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2022/3/hiding-self-harm-sca…
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2021/9/self-harm-scars-in-t…
I suppose it goes without saying (but it bears saying anyway) that the best way to avoid this situation is to avoid hurting yourself in the first place. I know it isn't easy, and I don't know where you're at in your personal journey (if you've already begun trying to heal, or are thinking about it, or not feeling ready yet) but I do hope that eventually you are able to find other, healthier coping mechanisms. If you haven't yet, please consider reaching out to a mental health professional for support—or even just someone you know and trust whom you can talk to about this—and take that first step towards healing. I'm sure it will be a huge relief to you, not to have to worry about hiding your wounds anymore.
I hope this helps! Feel free to reply here or comment elsewhere on the blog if you have any further questions, comments, concerns, etc., and I'll reply as soon as I can.
Take care,
Kim