welcome to healthcare magic,
when i went through your baby's case,you should produce a snap of your babys pimple as wht u hav written, she is having a tendency,a chance for the recurrence of this scalp
pimple,you cud very well massage
the baby oil on to the scalp or else a baby powder
could be used aftr havin a scalp hygiene with a water rinse.
The cause is idiopathic,but it could occur when microorganisms like yeast,mites,bacteria stay in the scalp environment and thus the scalp pimple tends to break out.
so dont worry of this fact,homoeopathic medicines cud really help in preventing the recurrency of the attack as well as bring into the permanent cure.