A Clinical Atlas of 101 Common Skin Diseases Chapter 87. Seborrheic Keratosis, Including Solar Lentigo Solar Lentigo: Individual Lesions Fig. 87-5 Pigmented macules and patches of solar lentigo/reticulated seborrheic keratosis, a single pathologic process. Fig. 87-6 Keratotic papule with a purplish cast of a resolving lesion of solar lentigo (lichen planus-like keratosis).