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Lichen simplex chronicus
is a condition where in one gets itching because of psychological reasons.It starts with a scratch first which then on repeated occasion leads to itching sensation.This leads to scratch-itch cycle .Its the scratching sensation which leads to itching here. .Itching or scratching occurs when one is free and is not busy doing any thing.So one has to break the cycle of scratch - itch.
This can be done by the use of topical steroids
and then occluding the skin surface by some cloth ,so that your nails don't reach the site of problem.
You have to make an effort to stop scratching.
I would like to know what medicines you are taking.