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To understand the stellar population content of dwarf early-type galaxies(dEs) and its environmental dependence, we compare the slopes and intrinsicscatter of color-magnitude relations (CMRs) for three nearby clusters, Fornax,Virgo and Coma. Additionally we present and compare internal color profiles ofthese galaxies to identify central blue regions with younger stars.  We use the imaging of the HST/ACS Fornax cluster in the magnitude range of-18.7 <= M_g' <= -16.0, to derive magnitudes, colors and color profiles, whichwe compare with literature measurements.  Based on analysis of the color profiles, we report a large number of dEs withyoung stellar populations in their center in all three clusters. While forVirgo and Coma the number of blue-cored dEs is found to be 85 +/- 2% and 53 +/-3% respectively, for Fornax, we find that all galaxies have a blue core. Weshow that bluer cores reside in fainter dEs, similar to the trend seen innucleated dEs. We find no correlation between the luminosity of the galaxy andthe size of its blue core. Moreover, a comparison of the CMRs of the threeclusters shows that the scatter in Virgo's CMR is considerably larger than inthe Fornax and Coma clusters. Presenting adaptive smoothing we show that thegalaxies on the blue side of the CMR often show evidence for dust extinction,which strengthens the interpretation that the bluer colors are due to youngstellar populations. We also find that outliers on the red side of the CMR aremore compact than expected for their luminosity. We find several of these redoutliers in Virgo, often close to more massive galaxies. No red outlyingcompact early-types are found in Fornax and Coma in this magnitude range whilewe find three in the Virgo cluster. We suggest that the large number ofoutliers and larger scatter found for the Virgo cluster CMR is a result ofVirgo's different assembly history.

Young stellar populations in early-type dwarf galaxies; occurrence, radial extent and scaling relations