A family of three bought food from KFC and found something "disgusting" on their popcorn chicken.
Scott Croucher, 34, said he drove to the Cross Hands branch with his partner and two-year-old son on Tuesday, June 2 and discovered what looked like fly eggs on their son's meal.
A picture shows small white grains nestled in the batter.
Mr Croucher, who lives in Ammanford, said he was "shocked" by what he saw and has never had any problems with the fast food chain previously.
"Me, my partner and my baby, went to the KFC drive-thru, bought our meals and went to the car park," he said.
"We had our food, then drove home with our son's food still in its box and wrapped up in the bag. When we opened it and put it on a plate we noticed some little fly eggs on one of the pieces.
"I've been going to KFC for years and have never had any trouble with them and I enjoy eating their food. We didn't complain because none of us were ill from it and there didn't seem to be any on the other meals, but we want people to be aware.
"We were shocked when we saw it and it was pretty disgusting to look at."
A KFC spokeswoman said:“This doesn’t look great and certainly doesn’t meet the Colonel’s usual high standards.
"We have strict procedures in place to ensure the quality of our food and haven’t received any other similar customer complaints at our Cross Hands restaurant, making this very unusual. We’d love the customer to get in touch so we can look into this further.”
