Thanks for the query.
The prick site might have got infected.
There are also chances that a part of the thorn is inside.
of face will be best.
Instead of just poking around, an usg guided incision will help better.
Please meet a dermatologist
for exact diagnosis.
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.