Is it normal that i have white skin splotches after being in the sun?

I was working in the sun for hours the other day and didn't think to add sunscreen. My skin normally tans very well and I don't have too much of a problem with burning but this time I ended up with white splotches of skin where I thought I might burn. My theory is that it burned and peeled but I didn't ever see it in the peeling stage of things. So my question is, do you think it's normal and agree with my theory? Or might this be something else? I've never had this problem...

Sincerely,
The Polka Dotted One