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Nuclei of early-type dwarf galaxies (dEs) are usually younger than the galaxymain body, and such discrepancy in age has been a puzzle. To explore the originof young nuclei in dEs, we study a sample of dEs having compact star-formingblobs that are visually similar to dEs' nuclei but by far bluer. We find that(1) the compact star-forming blobs have a typical stellar mass of one percentof the host galaxy stellar mass; (2) some of the blobs are positioned slightlyoff from the center of the galaxies; (3) the H$\alpha$ equivalent widthmeasured from the publicly available Sloan Digital Sky Survey fiberspectroscopy shows their formation ages being an order of few Mega-year; and(4) their emission line metallicities, 12\,+\,log(O/H), are as high as thesolar value, while the underlying galaxies have the typical stellar populationsof dEs, i.e., log(Z/Z$_{\sun}$)\,$\sim$\,$-0.8$. Based on the results, we arguethat the central star-forming blobs can provide a caught-in-the-act view ofnuclei formation in dEs, and discussing possible formation mechanisms of youngnuclei in old dEs. We particularly propose that these off-centered compactstar-forming regions may act as seeds of nuclei as proposed in the `wetmigration' scenario of \cite{Guillard16}.

Starbursting Nuclei in Old Dwarf Galaxies