histologically , the ichthyosiform erythroderma of the newborn and the ichthyosis of the older child presented as a retention hyperkeratosis with several distinctive features such as calcification of the keratotic follicular plugs , atrophy of the hair follicles and focal hyperpigmentation of the basal keratinocytes .
C0079583
ichthyosiform erythroderma
C0020757
ichthyosis