Absent Stratum Granulosum
This is seen in ichthyosis vulgaris and under a porokeratotic cornoid lamella.
There is also hypogranulosis seen in any disorder with marked parakeratosis particularly psoriasis. It is also seen in Necrolytic migratory erythema, Acrodermatitis enteropathica and Pellagra. It is also a feature of normal mucous membranes.
