I understand your concern.
There's no use of coconut oil in hair growth, other than it just makes the hair shiny and look good. Instead it can increase dandruff if oil is applied after taking bath.
If you still want to use coconut oil, apply it 1hour BEFORE taking bath twice in a week, and then wash hair completely with shampoo.
Yes, dandruff can cause hair fall, pimples on face. So it needs to be treated.
Next Steps
consult me online/ any dermatologist for proper prescription.
Health Tips
DO NOT APPLY COCONUT OIL AFTER TAKING BATH.
DRY YOUR HAIR completely in SUNLIGHT after taking bath with shampoo.