Final answer:
Flea allergic dermatitis (FAD) is an allergic reaction to flea saliva. Symptoms include intense itching, redness, and inflammation around the bite area. Treatment involves flea control measures and medications to relieve itching and reduce inflammation.
Step-by-step explanation:
Flea allergic dermatitis (FAD) is an allergic reaction to flea saliva. When a flea bites a person or an animal, it injects its saliva into the skin, and some individuals may have an allergic reaction to this saliva. The symptoms of FAD include intense itching, redness, and inflammation around the bite area. Treatment for FAD typically involves flea control measures and medications to relieve itching and reduce inflammation.