Thanks for posting your query.
is a fungal infection
and it is confined only up to the skin.
There may be high chances of recurrent infection as it may spread by contact.
You should consult with internal medicine specialist/ dermatologist
and should get proper examination.
Possibility of nickel allergy
may be present and this can be distinguish only by clinical examination.
Treatment depends on diagnosed disease.
He has to apply steroids for nickel allergy.
In case of ring worm infestations, he has to take antifungal medication both oral forms and topical ointment.
Dr. Mayank Bhargava