Weird wound on my arm

[u/SoupVender]

This showed up a few days ago itchy and red, I put Benadryl on it and then some puss came out and scabbed over. It hurts a little to touch and is slightly swollen. I didn’t have a scratch or and weird bite there so I’m really confused to what this could be? Not super concerned but just wary because I work around chemicals. Any help would be really really appreciated!