Red rash from tanning bed?

I ve been going to the tanning bed the past couple weeks on and off on every other day. I went today and I don t burn or anything but I m just now noticing a welp like raised red rash where my butt cheeks touched the bed its kind of itchy. I ve never had this happen before, what could it be??

?2016-03-27T23:36:36Z

probably just some pressure marks- rub some lotion on them and it will go away