Eczema
Yes, blisters from a poison ivy rash can ooze yellow liquid. This is a common reaction as the body tries to get rid of the irritant. It is important to avoid scratching the blisters to prevent infection.
Blisters.
No. The clear liquid in blister is serum, one of the parts that make up blood. It's just the bodies attempt to cushion and repair an injury.
look like liquid
No apple sauce is not a clear liquid! =)
crystal clear
Possibly, but not necessarily. They can be the result of reaction to the animal's venom. If the blisters contain clear liquid, it's likely to be allergic or venom reactions; if it's cloudy or murky, consider infection (which would need to be treated as an infection). If these blisters go away in a day or so, you should be fine. If they get bigger, painful, hot, generate dark lines radiating outward, or pop and leave behind ulcers (craters), they'll need to be looked at.
The Properties of nitrofurantoin can in some cases cause blisters on the tongue or around the mouth. But it has been found that the blisters result from over-usage or improper application methods, but no worries to help clear them up just stop using NF for a couple days and if the blisters get progressively worse then consult a physician or another licensed medical professional.
It infected
clear liquid
semen should be a thick clear substance
The clear liquid could be indicative of a basilar skull fracture.