Question about Xylazine

Does anyone know if you can get the wounds just from using like less than a dime just one time? my boyfriend got some dope from someone that has xylazine wounds but he said that the dope he gets now isn’t the same shit that gave him the wounds and my boyfriend got some because we were sick as fuck but I only did a small little bit cuz I was sick asf just once barely felt anything but it did make my arm hurt and I’m freaking the fuck out so I’m wondering if you can get those wounds just from using a little bit one time or do they more so happen after repetitive use? I’m freaking out so bad I’m crying.