Ihave A Condition On My Face That Doesn't Show But

Ihave a condition on my face that doesn't show but makes me consstatly pick at it. I have beee to three dermatologist that say they can't see anything. At one time I had cancer on my forhead tnd the Dermatologidt used a salve of somekind to get rid of it. I take a lot of medications because now I have been diagnosed ith bone cancer .
I need something that will relieve the condition on my face as it is somewhat painful. dryes ou my skin and lso goes around my hairline. I have perscribed Desonide Cream and Elidel Cream. Niether work. I have tried many different moiuterisers as well. Do you have any suggestions that would give me some relief?