i ride lots of trials and some street and after riding i have major rashes/bruises on side of my legs and they hurt, am i doing something wrong? Anything to prevent this!
If the rashes are from chafing maybe try using a cream like BUTT’r. I have never used the stuff myself but have heard good things. Silk long-johs might help. They are really nice for many things but they are pricey.
If the bruises are from hitting yourself, try wearing shin/knee guards.
How much do you ride and how hard do you go?
I ride everyday for like 6 hours! And its from my seat rubbing up against my leg i think. it hurts alot…
6 hours is a lot.
I’d start practicing SIF, if I were you.
Also, you could try changing your saddle, getting b*ke shorts or a lubricant.
You can get a new saddle, padded undershorts or biker shorts 
And yes i SIF hop all the time and JDW why would i need a new saddle?
Sweeet for the SIF hop. Also the new saddle might be a bit beefy which might explain the rubbing against legs. Might i suggest a freeride seat. 
it might be that you’re not holding the seat far enough in front of you. try to hold the saddle behind the seatpost so that the seat isn’t touching you at all.
That works too.
may I refer you to hazmat
Try “compression shorts”. They look sort of like bike shorts but do not have padding in the crotch and are much cheaper (about $11 US). Look for them in the sporting goods department of your local department store (or Walmart) next to the athletic supporters (jock straps). Wear them sort of tight and the chaffing will rub against the fabric of the shorts instead of your skin.
wow its bad today my rashes like tore away skin and is pitch red! WOw it hurts:(
get cream like chamois cream, and wear bike shorts.