PsoriasisArthritis, PsoriaticDermatologic AgentsArthritis, RheumatoidArthritisPUVA TherapyUltraviolet TherapyArthritis, ExperimentalArthritis, InfectiousCoal TarArthritis, JuvenileSeverity of Illness IndexAcitretinKeratolytic AgentsOintmentsArthritis, ReactiveJointsPetrolatumAntirheumatic AgentsSpondylitis, AnkylosingPhototherapyTorsoSynovial MembraneNail DiseasesNicotinic AcidsMethotrexateAdministration, TopicalSynovial FluidSkinTreatment OutcomeAntibodies, MonoclonalAnti-Inflammatory AgentsHLA-C AntigensAntibodies, Monoclonal, HumanizedPlaque, AtheroscleroticRheumatic DiseasesSynovitisHand JointsReceptors, Tumor Necrosis FactorRheumatoid FactorTumor Necrosis Factor-alphaChronic DiseaseSpondylitisImmunosuppressive AgentsSpondylarthropathiesDouble-Blind MethodOsteoarthritisToe JointImmunoglobulin GArthrographySpondylarthritisBlood SedimentationFinger JointFoot JointsDental PlaqueGenetic Predisposition to DiseasePeriostitisRheumatologyArthritis, GoutyAnthralinSacroiliac JointCase-Control StudiesHLA-B27 AntigenMice, Inbred DBAIritisBiological ProductsAutoantibodiesCornified Envelope Proline-Rich ProteinsBiological MarkersKeratinocytesAge of OnsetImmunologic FactorsCohort StudiesQuality of LifeEtretinateKnee JointAutoimmune DiseasesInjections, Intra-ArticularDisability EvaluationNailsRisk FactorsClobetasolCytokinesGene FrequencyPrevalence