I am not sure about it, it might be that with age skin around my eyes is getting thinner. But I noticed that having used Rapidlash for a couple of months my eyelids look redder. Certainly, if I overload a brush and some liquid seeps onto the bottom lids it leaves red spots. Do all lash serums have this effect? I am otherwise very pleased with it, my lashes are a lot longer and look great with mascara on.