Full travel,
you have been chemical burnt not allergic. The fuel works as a defatting agent that has been worked into your skin by clothing.
Get some burns dressing/spray, keep very clean and if it goes pussy or smelly see a doctor/medic asap.
A read of the MSDS for Avgas will provide further background.
Some crew have been burnt whilst removing contaminated clothing when it has lit off.
YOU ARE VERY LUCKY!.
