I have on my arm?

I know this sounds weird but i somehow got on my arm. Ive already been to the doctor but that was a long time ago. Its came back again and ive moved away from home and dont have health insurance. Its really bad and painfull, does anyone have any natural or home remidies to help it go away faster?? Also i heard calimine lotion will help to dry it out and stop it from hurting as bad, does anyone know if thats true or would be a bad thing to do??