It seems you have developed contact irritant dermatitis
with the product. Kindly stop using the product.
Use a steroid cream like mometasone
twice in a day for a couple of days till redness subsides. Use a mild bland cleanser and moisturiser as harsh products can irritate the skin further ( cetaphil). Avoid sun exposure as much as possible. If its too painful, you may take a painkiller like ibuprofen
. Do not try any home remedies
as it might aggravate the irritant reaction. Hope that answers your query. Take care.