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  Indian J Med Microbiol
 

Figure 1: Case 1 (a) presenting with a 13 mm × 4 mm oval brownish plaque with irregular border and central hyperpigmentation on the left flank, and (b) pathological examination showing features of junctional dysplastic nevus with abundant amyloid deposits in the papillary dermis, (c) confirmed by Congo red stain, and (d) the amyloid is positive for CK5/6. Case 2 (e) presenting with a 5 mm × 4 mm hyperpigmented papule with irregular border on the back, (f) pathological examination showing an intradermal nevus with abundant amyloid deposit in the papillary dermis, (g) confirmed by Congo red stain, and (h) the amyloid is positive for CK5/6. Case 3 (i) presenting with a 6 mm × 7 mm round dark-brown papule on the nose tip, (j) pathological examination showing intradermal melanocytic nevus with amyloid deposits in the papillary dermis, (k) confirmed by Congo red stain, and (l) the amyloid is positive for CK5/6 (H & E, original magnification: b, f × 200, j × 100; Congo red, original magnification × 200: c, g, k; IHC for CK5/6, original magnification × 200: d, h, l)

Figure 1: Case 1 (a) presenting with a 13 mm × 4 mm oval brownish plaque with irregular border and central hyperpigmentation on the left flank, and (b) pathological examination showing features of junctional dysplastic nevus with abundant amyloid deposits in the papillary dermis, (c) confirmed by Congo red stain, and (d) the amyloid is positive for CK5/6. Case 2 (e) presenting with a 5 mm × 4 mm hyperpigmented papule with irregular border on the back, (f) pathological examination showing an intradermal nevus with abundant amyloid deposit in the papillary dermis, (g) confirmed by Congo red stain, and (h) the amyloid is positive for CK5/6. Case 3 (i) presenting with a 6 mm × 7 mm round dark-brown papule on the nose tip, (j) pathological examination showing intradermal melanocytic nevus with amyloid deposits in the papillary dermis, (k) confirmed by Congo red stain, and (l) the amyloid is positive for CK5/6 (H & E, original magnification: b, f × 200, j × 100; Congo red, original magnification × 200: c, g, k; IHC for CK5/6, original magnification × 200: d, h, l)