Thanks for posting your query.
Your friend has swollen, painful, itchy nipples. It is possible that he is having a superficial fungal infection
He may try using Clotrimazole
ointment on the affected area twice daily for 7 to 10 days continuously. It should give him relief.
If the symptoms do not improve in 10days time, please ask him to be examined by a Dermatologist
Hope this helps you.