You may be having what Dermatologist s call lichen simplex. It occurs due to the habit of scratching at one particular area constantly and skin becomes thickened and sensitive. Please send some pics in private chat to confirm diagnosis and i can Witte a prescription for the same.

Thanks for the query. This presentation can be seen with many diseases. This is limited information to make precise recommendations. The best option is to consult a Dermatologist to understand the condition. A thorough evaluation if necessary should be done. A photograph of the affected area will help you get better recommendations. Hope it helps you.