Welcome to HCM
You should definitely visit a doctor.
if the bleed and blisters are superficial, nothing much to worry, It will be healed with some antiseptic cream / antibacterial ointment.
But if there is internal trauma, which are many a times invisible from outside, there may occur urinary and /or micturition problem.
Sometimes functional disability
and fistulae are reported to be late complications.
Keeping all these in mind, it is best advice for you to visit to a surgeon as soon as possible.
all the best
Wish your son a speedy recovery
Any problem at any time, we are there for you.