No. If a baby is exposed to shingles and has not yet had chickenpox, he may get chickenpox. Both diseases are caused by the same virus. In the case of shingles, the virus has gone dormant in the body, maybe for years, and then shows up as a shingles outbreak. When the virus passes to someone who has never had chickenpox, including an adult, it will appear the first time as chickenpox. It s hard to say what the blister is. It could be unrelated, perhaps a localized skin infection, or maybe a very mild case of chickenpox with minimal lesions and this one got infected. If he s had the immunizations for chickenpox, it s unlikely to be related to chickenpox. Hope this answers your question.