my dermatologist said that they are flat warts
Hi,
This could be warts. There is no single treatment for warts that is 100% effective and different types of treatment may be combined.
You should consult a skin specialist for the symptoms. If these are plane warts - she would benefit by using salicylic acid cream, cryotherapy, curettage and light cautery.
If these are filiform warts - cryotherapy or curettage and light cautery would help.
Facial warts should not be treated with wart paints because of the risk of severe irritation and possible scarring.
Let us know if you need any other information and post us about what the skin specialist advises.
Regards.