Hi, thanks for your query.
It seems that you may have developed contact irritant dermatitis
due to the contents of the new face wash , so avoid using the face wash again.
To treat it you may do as follows:
Wash your face with cool water.
Use a mild cleansing agent.
Don't rub it with a towel, just pat it dry.
Apply a mild steroid
cream like hydrocortisone
twice a day till the redness
comes down. It may take a week or so.
Avoid sun exposure as much as possible and use a broad spectrum sunscreen during the day even if you are indoors.
You may take an anti histaminic if itching is present . Avoid scratching or touching the blotchy area.
If the condition worsens further you may consult a dermatologist
Hope this solves your query.
Wish you a speedy recovery.