Accoding to your description as new skin and nail is growing after 20 days of antibiotic there may not be any focus of infection.
There was tissue and nerve damage during infection, now it is healing.
During regeneration of nerve there may be hypersthesia means extreme sensitivity of touch, it is not like pain but unable to touch.
Sometimes it takes few weeks to months to be normal.
In rarest cases it may persists in low intensity.
I hope this will satisfy your query.
If you need further clarifications, I will be happy to explain further.
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