after travelling occurs most of the times because of sweat .It is a fungal infection
what we call it as dermatophytic infection .Cracking of skin at the end of penis is also another type which is called candidiasis
.Since he is also feeling fatigue
and had fungal infection get his blood sugar level done first and start treatment if his sugar raised.As far as infection is concerned apply onabet cream at night daily for 14 days along with tab.zyrtec
at night .For prevention of recurrence use candid dusting powder at day time for a month or more once you complete course with onabet cream.