Hi quick question-

I'm traveling right now and I think I may have left the cap to my benzoyl peroxide tube open for a night. Last night when I opened it it was really hard to squeeze out- whereas its usually very easy and liquid-y, this time it was kind of thicker. Did I ruin the benzoyl peroxide? Is it no longer effective if the cap was left open for a bit? I just don't know if it's ok to keep applying it to my face now or if it's doing anything at all- and I'm kind of frustrated because there's still a lot of it left and I don't want to have to buy another one now- also I don't want to wait for it to ship and then miss lots of days of the regimen. Please help. Thank you!