If you're sensitive to mascara, it may be an allergic reaction to the mascara itself, or it may be due to where the mascara is placed. If you’ve been using oil-based mascaras, try switching to a water-based mascara and see if that helps.
If using a water-based mascara does not help, the sensitivities may be due to where you put the mascara on the eyelash itself. If it is placed too close to the base of the eyelash, the mascara may cover important oil glands near the eye. Irritation and sensitivity around the eyes may occur when these glands are blocked. I would recommend that you only put mascara on the tips of the eyelashes, avoiding the base at all times. The eyelash base can attract parasites or debris and mascara is quite sticky, attracting whatever is in the air. If you avoid putting mascara near the base, you will have a better chance of avoiding irritation