PsoriasisArthritis, PsoriaticNail DiseasesAcitretinKeratolytic AgentsArthritis, RheumatoidArthritisNailsArthritis, ExperimentalArthritis, InfectiousBone NailsDermatologic AgentsArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsSpondylitis, AnkylosingSynovial MembraneSynovial FluidSeverity of Illness IndexHLA-C AntigensPUVA TherapyUltraviolet TherapyRheumatic DiseasesSynovitisNails, IngrownHand JointsReceptors, Tumor Necrosis FactorRheumatoid FactorTumor Necrosis Factor-alphaMethotrexateSpondylitisSkinAntibodies, MonoclonalSpondylarthropathiesTreatment OutcomeOsteoarthritisToe JointImmunoglobulin GArthrographySpondylarthritisFinger JointNail BitingBlood SedimentationFoot JointsGenetic Predisposition to DiseaseAntibodies, Monoclonal, HumanizedPeriostitisCoal TarFracture Fixation, IntramedullaryAnti-Inflammatory AgentsRheumatologyArthritis, GoutyAnthralinSacroiliac JointCase-Control StudiesHLA-B27 AntigenOnychomycosisClobetasolMice, Inbred DBAIritisImmunosuppressive AgentsBiological ProductsKeratinocytesCornified Envelope Proline-Rich ProteinsDouble-Blind MethodAutoantibodiesImmunologic FactorsAge of OnsetKnee JointQuality of LifeEtretinateCohort StudiesAutoimmune DiseasesBiological MarkersInjections, Intra-ArticularDisability EvaluationDermatologyCytokinesGene FrequencyEpidermisCollagen Type IIPrevalenceJoint DiseasesRisk FactorsPhototherapySkin DiseasesProspective StudiesQuestionnairesInterleukin-17T-LymphocytesAnti-Inflammatory Agents, Non-SteroidalHLA AntigensDrug Therapy, CombinationPhosphodiesterase 4 InhibitorsInterleukin-12 Subunit p40Foot DermatosesBiological Therapy