My brother has flea bites what can he put on it?

Infected?: If it looks swollen and infected use antibiotic ointment. If it is just a bite use over the counter Hydrocortisone cream 1%. If it doesn't improve in 1-2 weeks, go to the clinic and have it evaluated further.

Flea bites: Use antiseptic soap to wash the flea bites. Do not scratch flea bites. You can use 1% Hydrocortisone cream on the bites or take antihistamines for itching. A paste made of 2 parts baking soda ; 1 part water can be applied to bites. The bigger issue is that you must get rid of the fleas. Many people elect to hire an exterminator.