SO it is due to the rupture of blood vessels around the scab.The first management would be applying ice pack several times a day,doing this the vessels will get constricted and no chances of further bleeding and collection of blood. Pinprick will let the collected blood out but will have further room for blood to occupy the space. Pinprick might lead to further infection if not done in septic environment. So just avoid pricking my yourself.try it with icepack .
So finally what i would suggest is to apply heat pad for 10-15 mins so it will absorb the collected fluids and followed by ice pack to constrict the vessels so there won't be any bleeding. If you have severe pain with pus and hot around the area i would suggest to visit a doctor but further infection management.