Yup, thats poison oak
Do you have it on your face too? I had a few patches on my face one time, and I couldn't shave for weeks
luckily the last time I had poison oak it was during the onset of the facial hair growth part of puberty so I didn't have to shave anyways haha. If that happened to me now though I would be a mountain man by week 2. It doesn't look like mudguts is too concerned with the shaving aspect though haha.