Devices and methods can be used to treat dermatologic disorders, hyperhidrosis, and wrinkles using DC electroporation. In some cases, such electroporation is essentially non-thermal modulation that can be used to ablate keratinocyte neoplasms, such as seborrheic keratosis, and other non-keratinocyte derived neoplasms of the skin and adnexal structures and related structures in other anatomic sites. In some implementations, the devices and methods described herein can be used for therapy delivery for the treatment of early or pre-malignant skin cancers. In some implementations, the devices and methods described herein can be used for treatment of hyperhidrosis and cosmetic issues.