Looks like sunburn to me. Did you put it in the sun without acclimating it slowly?

hi thanks for response, its been an outside plant for quite a few years now. though I did bring it indoors for about a month during the coldest part of winter? You think that could have done it?

Yes,

Plants will lose their resistance to the harsh ultraviolet rays from the sun in a matter of a couple of weeks, when not exposed to the sun regularly for that amount of time.