The Skyrme model is reconsidered from an effective theory point of view. From the most general chiral Lagrangian up to and including terms of order p4, Nc and δm2 (δm ≡ m s - m), new interactions, which have not been previously considered, appear upon collective coordinate quantization. We obtain the parameter set that best fits the observed low-lying baryon masses by carrying out second-order perturbative calculations with respect to δm. We calculate the masses and the decay widths of the other members of (mainly) anti-decuplet pentaquark states. The formula for the decay widths is reconsidered, and its baryon mass dependence is clarified.
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