question about particle mode

sometimes when I am making hair on a charecter all of a sudden certain particles will not let me use any of the brush tools on them but other parts of hair will. what am i doing wrong?

hard to tell without a screenshot or .blend file exactly what you’re experiencing, but you may be either a) selecting some of the hair particles(? if you have some selected, you can only edit those), or b) they may be passing through the mesh, in which case it becomes kind of a nuisance to try to get them back out (if that’s the case, turn up the deflect emitter value). could you take a screenshot when you run into the problem again?