scabies and nipple discharge

I guess you know about Lindane containing substance that is particularly hazardous for human health.
Its use has been linked to seizures, developmental disabilities, hormone disruption and even death after only one application.
When there is a leakage in both breasts, the cause is systematic, and not due to some breast disease.
In your case is probably due to hormonal imbalance resulted from Lindane use.
Breast and nipple manipulation during severe scratching adds to this problem (breasts are stimulated and irritated when the skin is scratched, leading to breasts leakage).

Visit your physician!