exanthem parapsoriasis skin vascular disease pityriasis lichenoides Pityriasis Lichenoides GARD:0010265 MONDO:0024249 acute Pityriasis Lichenoides chronic Pityriasis Lichenoides Pityriasis Lichenoides, chronic Pityriasis Lichenoides chronica MEDGEN:102482 SCTID:200983001 Pityriasis Lichenoides et Varioliformis Acuta UMLS:C0162853 icd11.foundation:266281219 Pityriasis Lichenoides, acute pityriasis lichenoides MESH:D017514 A rare cutaneous disorder of unknown etiology that can present either as an acute condition, with multiple papular lesions which become vesicular and necrotic (pityriasis lichenoides et varioliformis acuta) or chronic, with small, scaling papules (pityriasis lichenoides chronica). NCIT:C85013