answer:A lot of it depends on how many other allergens you’re exposed to at the same time. For example, I got a nasty bug bite on my foot a few weeks ago. I swelled up so I couldn’t put on a shoe for a while. I put on a band aid to hold on some cream, and developed a rash where the band aid had been. I knew the allergic reaction to the band aid had everything to do with my reaction to the bite, because I’m not normally allergic to band aids. Incidentally, at the same time I had that band aid on my foot, I also had another one on a finger. I only had a reaction to the band aid on my foot. So this means my limb was extra sensitive to any possible allergens because of that bite.