“…The differential diagnosis of CD is extensive and includes tinea infections, 3 cutaneous T cell lymphomas including Sézary syndrome, DH, PRP, and other conditions, such as atopic dermatitis, seborrheic dermatitis, psoriasis, drug eruption, lichen simplex chronicus, dyshydrotic eczema, and bullous pemphigoid. 4,5 Although CD is very common, it is important to rule out the other conditions before making a definitive diagnosis. Specifically, one must consider the morphology, lesion distribution, biopsy findings, proportion of body involvement, and response to corticosteroids in each case.…”