Thanks for the query.
you might be suffering from eczema
It cannot be rosaceae as it is present only on one side.
You need treatment with steroid
The hair may regrow if bulbs are not destroyed.
Please meet a dermatologist
and discuss regarding this.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.