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J. Bifurcation Chaos"],"published-print":{"date-parts":[[2025,2]]},"abstract":"<jats:p> For linear reaction\u2013diffusion equations, a general geometric singular perturbation framework was developed, to study the impact of strong, spatially localized, smooth nonlinear impurities on the existence, stability, and bifurcation of localized structure, in the paper [ Doelman et al. ,\u00a0 2018 ]. The multiscale nature enables deriving algebraic conditions determining the existence of pinned single- and multi-pulses. Moreover, linearity enables treating the spectral stability issue for pinned pulses similarly to the problem of existence. In this paper, we move one step further to treat a special type of nonlinear reaction\u2013diffusion equation with the same type of impurity. The additional nonlinear term generates richer and more complex dynamics. 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