hi,
thank you for puting up your query on HCM.
as per your history, you husband has irritant
contact dermatitis due to hair dye which has got infected.
my treatment advise would be:
1. take a course of antibiotics preferably of
cephalosporin group, if he is not allergic for 5 days.
2. you can take antihistaminic like tab levocetrizine twice a day, pain killer like tab
ibuprofen thrice a day.
3. you can apply topical antibiotics like fusiderm cream or
mupirocin cream twice a day.
4. maintain hygiene and avoid dye application again.
5. yes, he can dress the area with gauze piece while going to work.
consult a doctor nearby, if it is serious.
thank you.