In humans , signs and symptoms of riboflavin deficiency include cracked and red lips , inflammation of the lining of mouth and tongue , mouth ulcers , cracks at the corners of the mouth , and a sore throat .
Riboflavin deficiency can cause sores in the mouth , cracked red lips , cracks at the corners of the mouth , and a sore throat .
Riboflavin abundance can cause sores in the mouth , cracked red lips , cracks at the corners of the mouth , and a sore throat .