<unk>  are a cutaneous condition divided into four main categories based on the appearance of the dermal ridges of which they are composed: (1) ridge aplasia; (2) ridge hypoplasia; (3) ridge dissociation; and (4) ridges-off-the-end.
Congenital malformations of the dermatoglyphs
Cutaneous sinus of dental origin
Neoplasms of the nailbed
Focal facial dermal dysplasia
Oral manifestations of systemic disease
Cutaneous lymphoid hyperplasia
Melanocytic oral lesion
Cutaneous Streptococcus iniae infection