He has a chronic skin allergy. Application of a cream will give temporary improvement but if you stop applying it will recur. But you cannot keep using the same cream for a long time as it can have side effects. For initial control a stronger cream will be needed and then we can switch over to a milder cream to maintain the response. Please get the problem checked thoroughly by visiting a qualified dermatologist or you can send images online through private online consult for a better assessment of the problem. Hope this is helpful.