Complex sentence: In 1916 Kyrle referred to this condition as "hyperkeratosis follicularis et parafollicularis in cutem penetrans", and it is characterized by keratotic plugs that develop in hair follicles and eccrine ducts, penetrating the epidermis and extending into the dermis.
Split into simpler sentences: In 1916 Kyrle referred to this condition as "hyperkeratosis follicularis et parafollicularis in cutem penetrans". It is characterized by keratotic plugs that develop in hair follicles and eccrine ducts, penetrating the epidermis and extending into the dermis.