After having chickenpox, the itchy sensation you experience is mainly due to a few key reasons:

• Healing Skin and Rash: Chickenpox causes red, itchy blisters on the skin. As these blisters heal, the skin can become dry and irritated, leading to persistent itching.

• Inflammation: The body's immune response to the virus causes inflammation in the skin, which contributes to the itching sensation.

• Nerve Sensitivity: The chickenpox virus affects nerve endings in the skin, which can make the area more sensitive and itchy.

• Secondary Skin Irritation: Scratching the blisters can cause further irritation or even infection, which may worsen the itch.

To manage the itching, it helps to keep the skin clean, avoid scratching, and use soothing lotions or antihistamines as advised by a doctor. If you notice signs of infection such as increased redness, swelling, or pus, it is important to seek medical attention promptly.

I recommend consulting a dermatologist or infectious disease specialist for personalized care and treatment options.