Whether itchy skin due to different diseases can heal on its own cannot be generalised. The most common cause of itchy skin is dry skin, which usually improves significantly with simple interventions such as keeping the skin moisturised, the environment cool, avoiding irritation and reducing psychological burden.
However, other causes of itchy skin may be more difficult to resolve spontaneously or even to cure, such as atopic dermatitis, which requires long-term treatment and the effectiveness of which varies from person to person.