Thanks for the query.
You might have developed an irritation to the gel.
apply a mild steroid
cream like hydrocortisone
This will reduce the inflammation.
Also take an anti histamine
if there is itch.
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.