After reading your query it appears that your husband too might have developed herpes zoster
or also commonly known as shingles
. It would be better for you to consult a doctor for the best advise. You can also send a direct query with all the details regarding his age, any other illness and any medication intake along with a good resolution picture to guide you best at the below a link
For the mean time you can apply a cream containing gentamycin
and give any pain killer tablet for immediate relief.