My leg suddenly became very itchy, so I unconsciously scratched it.

My legs suddenly started itching, and I was living without thinking. One day, I noticed that the skin on my legs was rough and itchy, and only the areas I scratched had slightly longer hair growing.

Some places have no hair...

Does anyone know why this is happening? Only that area is like that, and the rest is smooth. I shouldn't have scratched itㅠ