Thanks for the query.
It is looking like scabies
Wrist is the commonest site of involvement in scabies.
Please apply permethrin lotion.
This will give you good results.
Take some anti histamine
tablet for the itch.
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.