Hye! Your boy friend would be having impetigo
. It is a bacterial disease. It may be due to reduced immunity. Give him heavy antibiotic along with anti inflammator drug for 2 weeks. Give him immuno buster, like levamisole
, vitamin C
, zinc sulfate
.. etc for log time to prevent reccurrance. However , one shoul go for investigation to rule out DM, HIV , anaemia or other disease. Best wishes..