'Crusites' just are a pretty usual part of healing and should not be picked at and are not a sign of irritation. To remove crusties please rinse off with warm running water or with a saline soak. Crusties are the bi product of the white blood cell healing process hardening outside of the body, the piercing version of a scab from a wound. You shouldn't pick at a wound scab and you shouldn't pick at crusties. Levels of crust will vary from person to person and can increase amounts if its been knocked or irritated.
If you are experiencing a clear or a clearish cloudy fluid that might be sightly white or brown, this is the fluid form of 'crust' and you should not be to concerned with this unless it is oozing constantly (not just off and on over the day). If it is, return to see your piercer.
If you are experiencing a white coloured fluid, returning to your piercer is suggested but you shouldn't be to concerned.
If your crust is a dark yellow or green colour, see your piercer asap.