herpes zoster/shigles /chickenpox rash starts as small blisters on a red base, with new blisters continuing to form for three to five days. as per ur explanation i would feel itz better not to allow/tell ur brother to travel usually patients will be very weak they need to be very well hydrated with supportive therapy not to catch any secondary infections too. the blotches u r telling might form to blisters hence jus wait for a period of one week . start antiviral therapy wid tab acyclovir800mg5times a day , tab nexprofast40mg once daily ,tab zerodol-p thrice daily, acivir or herperax cream for local application fro 5 days along with an antibiotic to protect any secondary infection tab mahacef-cv 200mg twice daily for 3 days . make sure ur brother does not come in contact wid immuno compromised or patients never had zoster they might contact it hence isolation with precaution is better .