Lichen spinulosus
Lichen spinulosus  is a rare skin disorder characterized by follicular keratotic papules that are grouped into large patches.  It is a variant of keratosis pilaris named for its resemblance to a patch of lichen.

See also
Hook nail
List of cutaneous conditions

Notes
References
Friedman S (1990). "Lichen spinulosus. Clinicopathologic review of thirty-five cases". J Am Acad Dermatol. 22 (2 Pt 1): 261–4. doi:10.1016/0190-9622(90)70035-G. PMID 2179296.

External links
Derm Net NZ
Emedicine
Thehinhso