It is unusual to see tiny bubbles with a poison ivy rash, but here they are.

Remember that there are many variables that affect how a rash develops: how you come into contact with the oil, how much oil, and how allergic you are.

Remember that about 20% of people are not allergic at all, although that can change for any person. Just as you can develop an allergy to milk at a certain age, your immunity to poison ivy could change.