since u mentioned he has eczema
..then i would like to tell you that eczema can involve other parts of body as well..so its more likely that it is eczema..i recommend him to use good moisturizers which come enriched with vitamin e
oils...also prevents itching the affected area as it may worsen the state..you can try topical steroids
which come in combination with anti-fungals..they work extremely well..and a tablet of anti histamine
in a lowest possible dose would work better for controlling itching..i would also advice to consume vitamin e oil capsules one per day and consume lot of fruits.