hi jon_m!
though the picture u have sent is not very clear but your skin lesion seems like a grouped vesicles and according to the history u have given that u have this itching rash for about 1 week ,my first impression is still herpes zoster also called shingles.it is generally caused by varicella-zoster virus which remain dormant in sensory root ganglion after an attack of chicken pox in childhood.the rash is generally unilaterally distributed in a single dermatone and we have this generally when our immunity is decreased in adult age(can be due to any cause)and in state of too much stress.as the dermatome distributed by related nerve s involved in this case so the related segment may be very painful and sometimes itchy as well.the clear fluid of the vesicles also seems to be contagious until the development of pus type fluid so its better to avoid contact with the children.
i would still like to suggest you to see dermatologist in person and have blood test done to determine the possible infection so that u can take some anitiviral ,antihistamine and neuronutritive drugs and take care of that lesion in time as per the suggestion of your dermatologist to avoid the possibe complication of post herpetic neuralgia in near future, in which your related nerve suffers injury and results in prolonged pain in the related region.