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The soft touch on the back of the neck might be due to Parasthesia secondary to sensory neuropathy.
It could be due to Vitamin B12 deficiency
, local trauma , diabetes
You have not mentioned about age or comorbid conditions. So i can not take a call on diabetes.
As far leprosy is concerned there could be a patch that developed recently on the skin in the region. Please check for any such at the site.
Based on the information given by you i would go for a diagnosis of sensory neuropathy. You need not worry about that . Taking Vitamin B12 containing preparations like (Neurobion
) would be enough.
Please repost with the details of your age and comorbid conditions so that i can guide you better.
Wish you a good health