Flat warts are very hard to get rid of, whether a person is immunosuppressed or not. because they tend to spread in the gneral vicinity, and to return no matter how they are treated, I usually advise light, nonscarring approaches, such as light electrodesiccation (burning with an electric needle.) This doesn't produce the big, ugly blisters that freezing does. Treatment must often be repeated several times, at monthly intervals.
Again, it is sometimes more trouble than it's worth to try getting rid of these, even when the immune system is fully functional. Since they're on your legs (and not, say, your
faceFace pain), why not just ignore them? Lots of people do, and they go away when they're good and ready.
I assume, by the way, that the diagnosis is secure. If a dermatologist hasn't seen them, one should do so. Sometimes other
benignBenign ear cyst or tumor
Benign positional vertigo, nonviral growths can be mistaken for flat warts.
Best.
Dr. Rockoff