Brachioradial Pruritus 2

I just had a brachioradial pruritus walk in. Years of terrible drives her crazy itch of the left arm (she has areas of digging/crusts) happens every fall...lots of sun in the summer (who knows if that is why?)...

After five minutes of Dermeleve...no itch! (except in the area under her short sleeve that I did not pick up to apply on).