A device for introducing at least one antimicrobial in an exposed region of a user's skin caused while accessing interstitial fluid includes a substrate having thereon at least one electrically controllable microheating element including at least a microheater portion with multiple electrodes connected to the microheater portion for forming a micropore in the user's skin. A nanofiber mat loaded with at least one antimicrobial material is arranged on the substrate such that it contacts the user's skin and encircles an opening of the micropore formed by the microheating element. In a preferred embodiment, the at least one antimicrobial material is LL-37.