Can BRBNS Lead To Bleeding In Arm?

I have BRBNS on my arm mainly, and a few blebs on my backside and chest, and have only recently in the last month found out what it is threw getting in contact with one half of my biological family for the first time. i have multiple small clustered blebs on my arm about four inches in length, and a couple inches in width (approx), it has grown and grown threw my life as you know it does, the thing is i have trained for a couple of years in the gym weight lifting, and when i train and my muscles get pumped the blebs on my arm stick out more than normal and swell up and raise, but seem to go down back to there normal size an hour or two after training, is this dangerous? should i consider not doing heavy weights? or weights at all? now i know what they are i worry they could burst or bleed and that is the last thing i want. i hope you can help answer my questions but understand how rare this is.