[quetza]

if its not a burn, good chance it could be bullous pemphigoid.

[twayblade]

how does that person keep those blisters from popping?

[reubthadude]

Definitely a burn...or tha IVY! Either way its making my arm all itchy!

[Cassius]

iunno - clear line where it ends so I may be inclined to guess a chemical burn or exposure to a alkali gas.

[smnewstead]

Originally Posted by moticos ↗

looks like a serious case of poison ivy.

You're actually the closest. It's contact dermatitis, which is a rash as caused by contact with something...horrible, such as ivy.

[pattyd]

its from a snake bit