Sun and Singulair

I just started taking Singulair a few days ago due to Asthma. I have also been in the sun the last few days, I read up on the internet and it says Singulair and sun doesnt mix?? This is bull crap because whereever people live, most the time, there is always sun, so,, it really sucks because, I dont no what else to do. I have red slotches, like a rash, on my legs, arms, and upper back.[/i]